Buffer over-read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

cve CVE-2026-81399 1 source, 1 claim · Watch

NVD writes:
Buffer over-read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally. the claim

Severity: MEDIUM NVD
CVSS: 5.5 NVD
Fixed in: 16.0.20326.20138, 16.0.5569.1003, 16.0.10417.20207, 16.113.26091433, 16.0.14334.20906, 16.0.17932.20976 NVD
Vendor: Microsoft NVD
Product: Microsoft 365 Apps for Enterprise NVD
CWE: CWE-126 NVD

How far exploitation has got

No public code known
Proof of concept
Proof of concept, verified
A Metasploit module
Exploited in the wild
Used in ransomware campaigns

Timeline

2026-09-08

first spoke of it: Buffer over-read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

NVD

What it is to other things

affects	microsoft/365_apps NVD
affects	microsoft/excel NVD
affects	microsoft/microsoft_365 NVD
affects	microsoft/office_2016 NVD
affects	microsoft/office_2019 NVD
affects	microsoft/office_2021 NVD
affects	microsoft/office_2024 NVD
made_by	microsoft NVD

In words only, so not counted until a person confirms one:

affects

microsoft/microsoft_365_apps_for_enterprise

NVD says “Microsoft · Microsoft 365 Apps for Enterprise”

Every value, with what each source said and its receipt

Property Source Said Means here

Automatable

automatable

NVD

At least one of those steps needs a person.

receipt

Source: NVD
Its words: no
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].automatable
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	no
2026-09-29 09:45 UTC	—

What the source handed over

{
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              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft 365 Apps for Enterprise",
            "vendor": "Microsoft",
            "versions": [
              {
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                "status": "affected",
                "version": "16.0.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Excel 2016",
            "vendor": "Microsoft",
            "versions": [
              {
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                "status": "affected",
                "version": "16.0.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office 2016",
            "vendor": "Microsoft",
            "versions": [
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                "status": "affected",
                "version": "16.0.0",
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          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office 2019",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.10417.20207",
                "status": "affected",
                "version": "19.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "product": "Microsoft Office 365 for Mac",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.113.26091433",
                "status": "affected",
                "version": "1.0.0",
                "versionType": "custom"
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            ]
          },
          {
            "platforms": [
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            ],
            "product": "Microsoft Office LTSC 2021",
            "vendor": "Microsoft",
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          {
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            ],
            "product": "Microsoft Office LTSC 2024",
            "vendor": "Microsoft",
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                "version": "16.0.1",
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            ]
          },
          {
            "product": "Microsoft Office LTSC for Mac 2024",
            "vendor": "Microsoft",
            "versions": [
              {
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                "status": "affected",
                "version": "16.0.0",
                "versionType": "custom"
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        ],
        "source": "secure@microsoft.com"
      }
    ],
    "configurations": [
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              },
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              {
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              },
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                "vulnerable": true
              },
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                "criteria": "cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x86:*",
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      }
    ],
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    "lastModified": "2026-09-17T20:18:39.677",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
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          "impactScore": 3.6,
          "source": "secure@microsoft.com",
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}

—

CVSS

cvss

NVD

5.5

receipt

Source: NVD
Its words: 5.5
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseScore || field:cve.metrics.cvssMetricV31[].cvssData.baseScore
Said since: 2026-09-29 09:45 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

{
  "cve": {
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      {
        "affectedData": [
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft 365 Apps for Enterprise",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.20326.20138",
                "status": "affected",
                "version": "16.0.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Excel 2016",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.5569.1003",
                "status": "affected",
                "version": "16.0.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office 2016",
            "vendor": "Microsoft",
            "versions": [
              {
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                "status": "affected",
                "version": "16.0.0",
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              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office 2019",
            "vendor": "Microsoft",
            "versions": [
              {
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                "status": "affected",
                "version": "19.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "product": "Microsoft Office 365 for Mac",
            "vendor": "Microsoft",
            "versions": [
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                "status": "affected",
                "version": "1.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office LTSC 2021",
            "vendor": "Microsoft",
            "versions": [
              {
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                "status": "affected",
                "version": "16.0.1",
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            ]
          },
          {
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              "x64-based Systems"
            ],
            "product": "Microsoft Office LTSC 2024",
            "vendor": "Microsoft",
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                "matchCriteriaId": "8887D177-26A3-4008-89B6-50A9E9830F13",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:macos:-:*",
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    ],
    "cveTags": [],
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        "lang": "en",
        "value": "Buffer over-read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally."
      }
    ],
    "id": "CVE-2026-81399",
    "lastModified": "2026-09-17T20:18:39.677",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.5,
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
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          "impactScore": 3.6,
          "source": "secure@microsoft.com",
          "type": "Secondary"
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        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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  }
}

—

CVSS vector

cvss_vector

NVD

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

receipt

Source: NVD
Its words: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.vectorString || field:cve.metrics.cvssMetricV31[].cvssData.vectorString
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft 365 Apps for Enterprise",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.20326.20138",
                "status": "affected",
                "version": "16.0.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Excel 2016",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.5569.1003",
                "status": "affected",
                "version": "16.0.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office 2016",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.5569.1003",
                "status": "affected",
                "version": "16.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office 2019",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.10417.20207",
                "status": "affected",
                "version": "19.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "product": "Microsoft Office 365 for Mac",
            "vendor": "Microsoft",
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              {
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                "status": "affected",
                "version": "1.0.0",
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            ]
          },
          {
            "platforms": [
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              "x64-based Systems"
            ],
            "product": "Microsoft Office LTSC 2021",
            "vendor": "Microsoft",
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              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office LTSC 2024",
            "vendor": "Microsoft",
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                "status": "affected",
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            ]
          },
          {
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            "vendor": "Microsoft",
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              }
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          },
          {
            "product": "Microsoft Office LTSC for Mac 2024",
            "vendor": "Microsoft",
            "versions": [
              {
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                "status": "affected",
                "version": "16.0.0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "secure@microsoft.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
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                "matchCriteriaId": "3259EBFE-AE2D-48B8-BE9A-E22BBDB31378",
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              },
              {
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                "matchCriteriaId": "CD25F492-9272-4836-832C-8439EBE64CCF",
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              },
              {
                "criteria": "cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x64:*",
                "matchCriteriaId": "CD88F667-6773-4DB7-B6C3-9C7B769C0808",
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              {
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                "matchCriteriaId": "B342EF98-B414-44D0-BAFB-FCA24294EECE",
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                "criteria": "cpe:2.3:a:microsoft:microsoft_365:-:*:*:*:*:macos:*:*",
                "matchCriteriaId": "12418BDE-FA2E-4BBF-8E47-45C505399898",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2016:-:*:*:*:-:*:x64:*",
                "matchCriteriaId": "45A9ECE7-F173-47AB-A420-0B6F64A04D21",
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                "matchCriteriaId": "14D63E3F-A431-4DD8-979F-811E8DAC423D",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x64:*",
                "matchCriteriaId": "1D518075-3362-4D15-93B1-0E6C61518D16",
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              },
              {
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                "matchCriteriaId": "1059BEC6-C30B-4F0F-A878-5267A21CBD85",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:macos:-:*",
                "matchCriteriaId": "0DB3EBBF-E0C4-4D5A-8D22-107463AD1DE4",
                "vulnerable": true
              },
              {
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                "matchCriteriaId": "55A9AFDA-D77B-4CC7-ACE5-3A2ABDA257D8",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x86:*",
                "matchCriteriaId": "8887D177-26A3-4008-89B6-50A9E9830F13",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:macos:-:*",
                "matchCriteriaId": "589B470B-9C2E-41E2-A44D-D8CCB4D2F933",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Buffer over-read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally."
      }
    ],
    "id": "CVE-2026-81399",
    "lastModified": "2026-09-17T20:18:39.677",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 1.8,
          "impactScore": 3.6,
          "source": "secure@microsoft.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-81399",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-08T19:42:17.663327Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-08T18:20:56.560",
    "references": [
      {
        "source": "secure@microsoft.com",
        "tags": [
          "Patch",
          "Vendor Advisory"
        ],
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81399"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-126"
          }
        ],
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}

—

CWE

cwe

NVD

CWE-126

receipt

Source: NVD
Its words: CWE-126
Read by: field:cve.weaknesses[].description[].value
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	CWE-126
2026-09-29 09:45 UTC	—

What the source handed over

{
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      {
        "affectedData": [
          {
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              "32-bit Systems",
              "x64-based Systems"
            ],
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            "vendor": "Microsoft",
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                "status": "affected",
                "version": "16.0.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Excel 2016",
            "vendor": "Microsoft",
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                "version": "16.0.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office 2016",
            "vendor": "Microsoft",
            "versions": [
              {
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                "status": "affected",
                "version": "16.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office 2019",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.10417.20207",
                "status": "affected",
                "version": "19.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "product": "Microsoft Office 365 for Mac",
            "vendor": "Microsoft",
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                "status": "affected",
                "version": "1.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
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              "x64-based Systems"
            ],
            "product": "Microsoft Office LTSC 2021",
            "vendor": "Microsoft",
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                "status": "affected",
                "version": "16.0.1",
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            ]
          },
          {
            "platforms": [
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              "x64-based Systems"
            ],
            "product": "Microsoft Office LTSC 2024",
            "vendor": "Microsoft",
            "versions": [
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                "status": "affected",
                "version": "16.0.0",
                "versionType": "custom"
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            ]
          },
          {
            "product": "Microsoft Office LTSC for Mac 2021",
            "vendor": "Microsoft",
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                "status": "affected",
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              }
            ]
          },
          {
            "product": "Microsoft Office LTSC for Mac 2024",
            "vendor": "Microsoft",
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                "version": "16.0.0",
                "versionType": "custom"
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          }
        ],
        "source": "secure@microsoft.com"
      }
    ],
    "configurations": [
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                "vulnerable": true
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              {
                "criteria": "cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x64:*",
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              {
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              {
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                "vulnerable": true
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              {
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              {
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                "matchCriteriaId": "1D518075-3362-4D15-93B1-0E6C61518D16",
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              {
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                "vulnerable": true
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              {
                "criteria": "cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:macos:-:*",
                "matchCriteriaId": "0DB3EBBF-E0C4-4D5A-8D22-107463AD1DE4",
                "vulnerable": true
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              {
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                "vulnerable": true
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                "criteria": "cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x86:*",
                "matchCriteriaId": "8887D177-26A3-4008-89B6-50A9E9830F13",
                "vulnerable": true
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                "criteria": "cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:macos:-:*",
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            "negate": false,
            "operator": "OR"
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    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Buffer over-read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally."
      }
    ],
    "id": "CVE-2026-81399",
    "lastModified": "2026-09-17T20:18:39.677",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
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          "impactScore": 3.6,
          "source": "secure@microsoft.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-81399",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-08T19:42:17.663327Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-08T18:20:56.560",
    "references": [
      {
        "source": "secure@microsoft.com",
        "tags": [
          "Patch",
          "Vendor Advisory"
        ],
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81399"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-126"
          }
        ],
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}

—

Exploitation

exploitation

NVD

none

No evidence of exploitation, and no public proof of concept.

receipt

Source: NVD
Its words: none
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].exploitation
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	none
2026-09-29 09:45 UTC	—

What the source handed over

{
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      {
        "affectedData": [
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft 365 Apps for Enterprise",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.20326.20138",
                "status": "affected",
                "version": "16.0.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Excel 2016",
            "vendor": "Microsoft",
            "versions": [
              {
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                "status": "affected",
                "version": "16.0.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office 2016",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.5569.1003",
                "status": "affected",
                "version": "16.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office 2019",
            "vendor": "Microsoft",
            "versions": [
              {
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                "status": "affected",
                "version": "19.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "product": "Microsoft Office 365 for Mac",
            "vendor": "Microsoft",
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                "status": "affected",
                "version": "1.0.0",
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              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office LTSC 2021",
            "vendor": "Microsoft",
            "versions": [
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                "status": "affected",
                "version": "16.0.1",
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              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office LTSC 2024",
            "vendor": "Microsoft",
            "versions": [
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                "status": "affected",
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                "versionType": "custom"
              }
            ]
          },
          {
            "product": "Microsoft Office LTSC for Mac 2021",
            "vendor": "Microsoft",
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          },
          {
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            "vendor": "Microsoft",
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              }
            ]
          }
        ],
        "source": "secure@microsoft.com"
      }
    ],
    "configurations": [
      {
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          {
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              },
              {
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                "matchCriteriaId": "CD25F492-9272-4836-832C-8439EBE64CCF",
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                "matchCriteriaId": "12418BDE-FA2E-4BBF-8E47-45C505399898",
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              {
                "criteria": "cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x64:*",
                "matchCriteriaId": "241CDE2B-ABD0-4EFF-8D73-1766E32FA20F",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x86:*",
                "matchCriteriaId": "14D63E3F-A431-4DD8-979F-811E8DAC423D",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x64:*",
                "matchCriteriaId": "1D518075-3362-4D15-93B1-0E6C61518D16",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x86:*",
                "matchCriteriaId": "1059BEC6-C30B-4F0F-A878-5267A21CBD85",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:macos:-:*",
                "matchCriteriaId": "0DB3EBBF-E0C4-4D5A-8D22-107463AD1DE4",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x64:*",
                "matchCriteriaId": "55A9AFDA-D77B-4CC7-ACE5-3A2ABDA257D8",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x86:*",
                "matchCriteriaId": "8887D177-26A3-4008-89B6-50A9E9830F13",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:macos:-:*",
                "matchCriteriaId": "589B470B-9C2E-41E2-A44D-D8CCB4D2F933",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Buffer over-read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally."
      }
    ],
    "id": "CVE-2026-81399",
    "lastModified": "2026-09-17T20:18:39.677",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 1.8,
          "impactScore": 3.6,
          "source": "secure@microsoft.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-81399",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-08T19:42:17.663327Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-08T18:20:56.560",
    "references": [
      {
        "source": "secure@microsoft.com",
        "tags": [
          "Patch",
          "Vendor Advisory"
        ],
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81399"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-126"
          }
        ],
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}

—

Fixed in

fixed_in

NVD

16.0.20326.20138, 16.0.5569.1003, 16.0.10417.20207, 16.113.26091433, 16.0.14334.20906, 16.0.17932.20976

receipt

Source: NVD
Its words: 16.0.20326.20138, 16.0.5569.1003, 16.0.10417.20207, 16.113.26091433, 16.0.14334.20906, 16.0.17932.20976
Read by: field:cve.affected[].affectedData[].versions[status=affected].lessThan
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	16.0.20326.20138, 16.0.5569.1003, 16.0.10417.20207, 16.113.26091433, 16.0.14334.20906, 16.0.17932.20976
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft 365 Apps for Enterprise",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.20326.20138",
                "status": "affected",
                "version": "16.0.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Excel 2016",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.5569.1003",
                "status": "affected",
                "version": "16.0.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office 2016",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.5569.1003",
                "status": "affected",
                "version": "16.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office 2019",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.10417.20207",
                "status": "affected",
                "version": "19.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "product": "Microsoft Office 365 for Mac",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.113.26091433",
                "status": "affected",
                "version": "1.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office LTSC 2021",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.14334.20906",
                "status": "affected",
                "version": "16.0.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office LTSC 2024",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.17932.20976",
                "status": "affected",
                "version": "16.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "product": "Microsoft Office LTSC for Mac 2021",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.113.26091433",
                "status": "affected",
                "version": "16.0.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "product": "Microsoft Office LTSC for Mac 2024",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.113.26091433",
                "status": "affected",
                "version": "16.0.0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "secure@microsoft.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*",
                "matchCriteriaId": "3259EBFE-AE2D-48B8-BE9A-E22BBDB31378",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*",
                "matchCriteriaId": "CD25F492-9272-4836-832C-8439EBE64CCF",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x64:*",
                "matchCriteriaId": "CD88F667-6773-4DB7-B6C3-9C7B769C0808",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x86:*",
                "matchCriteriaId": "B342EF98-B414-44D0-BAFB-FCA24294EECE",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:microsoft_365:-:*:*:*:*:macos:*:*",
                "matchCriteriaId": "12418BDE-FA2E-4BBF-8E47-45C505399898",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2016:-:*:*:*:-:*:x64:*",
                "matchCriteriaId": "45A9ECE7-F173-47AB-A420-0B6F64A04D21",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2016:-:*:*:*:-:*:x86:*",
                "matchCriteriaId": "BF3B9F15-3077-4BC5-9EC5-7416A9FBDC70",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x64:*",
                "matchCriteriaId": "241CDE2B-ABD0-4EFF-8D73-1766E32FA20F",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x86:*",
                "matchCriteriaId": "14D63E3F-A431-4DD8-979F-811E8DAC423D",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x64:*",
                "matchCriteriaId": "1D518075-3362-4D15-93B1-0E6C61518D16",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x86:*",
                "matchCriteriaId": "1059BEC6-C30B-4F0F-A878-5267A21CBD85",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:macos:-:*",
                "matchCriteriaId": "0DB3EBBF-E0C4-4D5A-8D22-107463AD1DE4",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x64:*",
                "matchCriteriaId": "55A9AFDA-D77B-4CC7-ACE5-3A2ABDA257D8",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x86:*",
                "matchCriteriaId": "8887D177-26A3-4008-89B6-50A9E9830F13",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:macos:-:*",
                "matchCriteriaId": "589B470B-9C2E-41E2-A44D-D8CCB4D2F933",
                "vulnerable": true
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            ],
            "negate": false,
            "operator": "OR"
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        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Buffer over-read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally."
      }
    ],
    "id": "CVE-2026-81399",
    "lastModified": "2026-09-17T20:18:39.677",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 1.8,
          "impactScore": 3.6,
          "source": "secure@microsoft.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-81399",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-08T19:42:17.663327Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-08T18:20:56.560",
    "references": [
      {
        "source": "secure@microsoft.com",
        "tags": [
          "Patch",
          "Vendor Advisory"
        ],
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81399"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-126"
          }
        ],
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}

—

Product

product

NVD

Microsoft 365 Apps for Enterprise

receipt

Source: NVD
Its words: Microsoft 365 Apps for Enterprise
Read by: field:cve.affected[].affectedData[].product
Said since: 2026-09-29 17:49 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-09-29 17:49 UTC	Microsoft 365 Apps for Enterprise
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft 365 Apps for Enterprise",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.20326.20138",
                "status": "affected",
                "version": "16.0.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Excel 2016",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.5569.1003",
                "status": "affected",
                "version": "16.0.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office 2016",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.5569.1003",
                "status": "affected",
                "version": "16.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office 2019",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.10417.20207",
                "status": "affected",
                "version": "19.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "product": "Microsoft Office 365 for Mac",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.113.26091433",
                "status": "affected",
                "version": "1.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office LTSC 2021",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.14334.20906",
                "status": "affected",
                "version": "16.0.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office LTSC 2024",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.17932.20976",
                "status": "affected",
                "version": "16.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "product": "Microsoft Office LTSC for Mac 2021",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.113.26091433",
                "status": "affected",
                "version": "16.0.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "product": "Microsoft Office LTSC for Mac 2024",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.113.26091433",
                "status": "affected",
                "version": "16.0.0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "secure@microsoft.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
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                "vulnerable": true
              },
              {
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                "matchCriteriaId": "CD25F492-9272-4836-832C-8439EBE64CCF",
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              {
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              },
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              },
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              },
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              {
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              {
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              },
              {
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              },
              {
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                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:macos:-:*",
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                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
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        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Buffer over-read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally."
      }
    ],
    "id": "CVE-2026-81399",
    "lastModified": "2026-09-17T20:18:39.677",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 1.8,
          "impactScore": 3.6,
          "source": "secure@microsoft.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-81399",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-08T19:42:17.663327Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-08T18:20:56.560",
    "references": [
      {
        "source": "secure@microsoft.com",
        "tags": [
          "Patch",
          "Vendor Advisory"
        ],
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81399"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-126"
          }
        ],
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}

—

Severity

severity

NVD

MEDIUM

From 4.0 to 6.9.

receipt

Source: NVD
Its words: MEDIUM
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseSeverity || field:cve.metrics.cvssMetricV31[].cvssData.baseSeverity
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	MEDIUM
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft 365 Apps for Enterprise",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.20326.20138",
                "status": "affected",
                "version": "16.0.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Excel 2016",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.5569.1003",
                "status": "affected",
                "version": "16.0.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office 2016",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.5569.1003",
                "status": "affected",
                "version": "16.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office 2019",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.10417.20207",
                "status": "affected",
                "version": "19.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "product": "Microsoft Office 365 for Mac",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.113.26091433",
                "status": "affected",
                "version": "1.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office LTSC 2021",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.14334.20906",
                "status": "affected",
                "version": "16.0.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office LTSC 2024",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.17932.20976",
                "status": "affected",
                "version": "16.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "product": "Microsoft Office LTSC for Mac 2021",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.113.26091433",
                "status": "affected",
                "version": "16.0.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "product": "Microsoft Office LTSC for Mac 2024",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.113.26091433",
                "status": "affected",
                "version": "16.0.0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "secure@microsoft.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*",
                "matchCriteriaId": "3259EBFE-AE2D-48B8-BE9A-E22BBDB31378",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*",
                "matchCriteriaId": "CD25F492-9272-4836-832C-8439EBE64CCF",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x64:*",
                "matchCriteriaId": "CD88F667-6773-4DB7-B6C3-9C7B769C0808",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x86:*",
                "matchCriteriaId": "B342EF98-B414-44D0-BAFB-FCA24294EECE",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:microsoft_365:-:*:*:*:*:macos:*:*",
                "matchCriteriaId": "12418BDE-FA2E-4BBF-8E47-45C505399898",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2016:-:*:*:*:-:*:x64:*",
                "matchCriteriaId": "45A9ECE7-F173-47AB-A420-0B6F64A04D21",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2016:-:*:*:*:-:*:x86:*",
                "matchCriteriaId": "BF3B9F15-3077-4BC5-9EC5-7416A9FBDC70",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x64:*",
                "matchCriteriaId": "241CDE2B-ABD0-4EFF-8D73-1766E32FA20F",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x86:*",
                "matchCriteriaId": "14D63E3F-A431-4DD8-979F-811E8DAC423D",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x64:*",
                "matchCriteriaId": "1D518075-3362-4D15-93B1-0E6C61518D16",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x86:*",
                "matchCriteriaId": "1059BEC6-C30B-4F0F-A878-5267A21CBD85",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:macos:-:*",
                "matchCriteriaId": "0DB3EBBF-E0C4-4D5A-8D22-107463AD1DE4",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x64:*",
                "matchCriteriaId": "55A9AFDA-D77B-4CC7-ACE5-3A2ABDA257D8",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x86:*",
                "matchCriteriaId": "8887D177-26A3-4008-89B6-50A9E9830F13",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:macos:-:*",
                "matchCriteriaId": "589B470B-9C2E-41E2-A44D-D8CCB4D2F933",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Buffer over-read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally."
      }
    ],
    "id": "CVE-2026-81399",
    "lastModified": "2026-09-17T20:18:39.677",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 1.8,
          "impactScore": 3.6,
          "source": "secure@microsoft.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-81399",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-08T19:42:17.663327Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-08T18:20:56.560",
    "references": [
      {
        "source": "secure@microsoft.com",
        "tags": [
          "Patch",
          "Vendor Advisory"
        ],
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81399"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-126"
          }
        ],
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}

medium

Status

status

NVD

Analyzed

receipt

Source: NVD
Its words: Analyzed
Read by: field:cve.vulnStatus
Said since: 2026-09-29 09:45 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft 365 Apps for Enterprise",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.20326.20138",
                "status": "affected",
                "version": "16.0.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Excel 2016",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.5569.1003",
                "status": "affected",
                "version": "16.0.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office 2016",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.5569.1003",
                "status": "affected",
                "version": "16.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office 2019",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.10417.20207",
                "status": "affected",
                "version": "19.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "product": "Microsoft Office 365 for Mac",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.113.26091433",
                "status": "affected",
                "version": "1.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office LTSC 2021",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.14334.20906",
                "status": "affected",
                "version": "16.0.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office LTSC 2024",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.17932.20976",
                "status": "affected",
                "version": "16.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "product": "Microsoft Office LTSC for Mac 2021",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.113.26091433",
                "status": "affected",
                "version": "16.0.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "product": "Microsoft Office LTSC for Mac 2024",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.113.26091433",
                "status": "affected",
                "version": "16.0.0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "secure@microsoft.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*",
                "matchCriteriaId": "3259EBFE-AE2D-48B8-BE9A-E22BBDB31378",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*",
                "matchCriteriaId": "CD25F492-9272-4836-832C-8439EBE64CCF",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x64:*",
                "matchCriteriaId": "CD88F667-6773-4DB7-B6C3-9C7B769C0808",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x86:*",
                "matchCriteriaId": "B342EF98-B414-44D0-BAFB-FCA24294EECE",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:microsoft_365:-:*:*:*:*:macos:*:*",
                "matchCriteriaId": "12418BDE-FA2E-4BBF-8E47-45C505399898",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2016:-:*:*:*:-:*:x64:*",
                "matchCriteriaId": "45A9ECE7-F173-47AB-A420-0B6F64A04D21",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2016:-:*:*:*:-:*:x86:*",
                "matchCriteriaId": "BF3B9F15-3077-4BC5-9EC5-7416A9FBDC70",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x64:*",
                "matchCriteriaId": "241CDE2B-ABD0-4EFF-8D73-1766E32FA20F",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x86:*",
                "matchCriteriaId": "14D63E3F-A431-4DD8-979F-811E8DAC423D",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x64:*",
                "matchCriteriaId": "1D518075-3362-4D15-93B1-0E6C61518D16",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x86:*",
                "matchCriteriaId": "1059BEC6-C30B-4F0F-A878-5267A21CBD85",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:macos:-:*",
                "matchCriteriaId": "0DB3EBBF-E0C4-4D5A-8D22-107463AD1DE4",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x64:*",
                "matchCriteriaId": "55A9AFDA-D77B-4CC7-ACE5-3A2ABDA257D8",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x86:*",
                "matchCriteriaId": "8887D177-26A3-4008-89B6-50A9E9830F13",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:macos:-:*",
                "matchCriteriaId": "589B470B-9C2E-41E2-A44D-D8CCB4D2F933",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Buffer over-read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally."
      }
    ],
    "id": "CVE-2026-81399",
    "lastModified": "2026-09-17T20:18:39.677",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 1.8,
          "impactScore": 3.6,
          "source": "secure@microsoft.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-81399",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-08T19:42:17.663327Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-08T18:20:56.560",
    "references": [
      {
        "source": "secure@microsoft.com",
        "tags": [
          "Patch",
          "Vendor Advisory"
        ],
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81399"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-126"
          }
        ],
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}

—

Technical impact

technical_impact

NVD

partial

The attacker gains limited control, or limited information.

receipt

Source: NVD
Its words: partial
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].technicalImpact
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	partial
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft 365 Apps for Enterprise",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.20326.20138",
                "status": "affected",
                "version": "16.0.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Excel 2016",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.5569.1003",
                "status": "affected",
                "version": "16.0.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office 2016",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.5569.1003",
                "status": "affected",
                "version": "16.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office 2019",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.0.10417.20207",
                "status": "affected",
                "version": "19.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "product": "Microsoft Office 365 for Mac",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "16.113.26091433",
                "status": "affected",
                "version": "1.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Microsoft Office LTSC 2021",
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    ],
    "cveTags": [],
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        "lang": "en",
        "value": "Buffer over-read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally."
      }
    ],
    "id": "CVE-2026-81399",
    "lastModified": "2026-09-17T20:18:39.677",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.5,
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            "confidentialityImpact": "HIGH",
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      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
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            ],
            "role": "CISA Coordinator",
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          }
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      ]
    },
    "published": "2026-09-08T18:20:56.560",
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        "source": "secure@microsoft.com",
        "tags": [
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        ],
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81399"
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    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
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        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}

—

Vendor

vendor

NVD

Microsoft

receipt

Source: NVD
Its words: Microsoft
Read by: field:cve.affected[].affectedData[].vendor
Said since: 2026-09-29 17:49 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-09-29 17:49 UTC	Microsoft
2026-09-29 09:45 UTC	—

What the source handed over

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    ]
  }
}

—

Every claim, by kind

vulnerability

Buffer over-read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

zetlyn/cve-nvd · 2026-09-08

automatable no cvss 5.5 cvss_vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N cwe CWE-126 exploitation none fixed_in 16.0.20326.20138, 16.0.5569.1003, 16.0.10417.20207, 16.113.26091433, 16.0.14334.20906, 16.0.17932.20976 product Microsoft 365 Apps for Enterprise severity MEDIUM status Analyzed technical_impact partial vendor Microsoft

source