Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate privileges over a network.

zetlyn/cve-nvd vulnerability cve CVE-2026-96940 known 2026-10-02

https://nvd.nist.gov/vuln/detail/CVE-2026-96940

Properties

cvss8.8
receipt
Source
NVD
Its words
8.8
Read by
field:cve.metrics.cvssMetricV31[].cvssData.baseScore
Said since
2026-10-03 00:06 UTC
Last answered
2026-10-04 18:16 UTC
Original
open at the source
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Microsoft Exchange Server 2016 Cumulative Update 23",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "15.01.2507.075",
                "status": "affected",
                "version": "15.01.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Microsoft Exchange Server 2019 Cumulative Update 14",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "15.02.1544.048",
                "status": "affected",
                "version": "15.02.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Microsoft Exchange Server 2019 Cumulative Update 15",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "15.02.1748.053",
                "status": "affected",
                "version": "15.02.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Microsoft Exchange Server Subscription Edition RTM",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "15.02.2562.053",
                "status": "affected",
                "version": "15.02.0.0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "secure@microsoft.com"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate privileges over a network."
      }
    ],
    "id": "CVE-2026-96940",
    "lastModified": "2026-10-02T21:16:58.060",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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          "impactScore": 5.9,
          "source": "secure@microsoft.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
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            "role": "CISA Coordinator",
            "timestamp": "2026-10-02T20:14:42.856638Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-10-02T19:16:43.023",
    "references": [
      {
        "source": "secure@microsoft.com",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96940"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Received",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-1390"
          }
        ],
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}
productMicrosoft Exchange Server 2016 Cumulative Update 23
receipt
Source
NVD
Its words
Microsoft Exchange Server 2016 Cumulative Update 23
Read by
field:cve.affected[].affectedData[].product
Said since
2026-10-03 00:06 UTC
Last answered
2026-10-04 18:16 UTC
Original
open at the source
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Microsoft Exchange Server 2016 Cumulative Update 23",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "15.01.2507.075",
                "status": "affected",
                "version": "15.01.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Microsoft Exchange Server 2019 Cumulative Update 14",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "15.02.1544.048",
                "status": "affected",
                "version": "15.02.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Microsoft Exchange Server 2019 Cumulative Update 15",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "15.02.1748.053",
                "status": "affected",
                "version": "15.02.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Microsoft Exchange Server Subscription Edition RTM",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "15.02.2562.053",
                "status": "affected",
                "version": "15.02.0.0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "secure@microsoft.com"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate privileges over a network."
      }
    ],
    "id": "CVE-2026-96940",
    "lastModified": "2026-10-02T21:16:58.060",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 5.9,
          "source": "secure@microsoft.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
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          "ssvcData": {
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            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-10-02T20:14:42.856638Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-10-02T19:16:43.023",
    "references": [
      {
        "source": "secure@microsoft.com",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96940"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Received",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-1390"
          }
        ],
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}
statusReceived
receipt
Source
NVD
Its words
Received
Read by
field:cve.vulnStatus
Said since
2026-10-03 00:06 UTC
Last answered
2026-10-04 18:16 UTC
Original
open at the source
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Microsoft Exchange Server 2016 Cumulative Update 23",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "15.01.2507.075",
                "status": "affected",
                "version": "15.01.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Microsoft Exchange Server 2019 Cumulative Update 14",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "15.02.1544.048",
                "status": "affected",
                "version": "15.02.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Microsoft Exchange Server 2019 Cumulative Update 15",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "15.02.1748.053",
                "status": "affected",
                "version": "15.02.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Microsoft Exchange Server Subscription Edition RTM",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "15.02.2562.053",
                "status": "affected",
                "version": "15.02.0.0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "secure@microsoft.com"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate privileges over a network."
      }
    ],
    "id": "CVE-2026-96940",
    "lastModified": "2026-10-02T21:16:58.060",
    "metrics": {
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            "attackComplexity": "LOW",
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            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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      "ssvcV203": [
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            "timestamp": "2026-10-02T20:14:42.856638Z",
            "version": "2.0.3"
          }
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      ]
    },
    "published": "2026-10-02T19:16:43.023",
    "references": [
      {
        "source": "secure@microsoft.com",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96940"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Received",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-1390"
          }
        ],
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}
vendorMicrosoft
receipt
Source
NVD
Its words
Microsoft
Read by
field:cve.affected[].affectedData[].vendor
Said since
2026-10-03 00:06 UTC
Last answered
2026-10-04 18:16 UTC
Original
open at the source
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Microsoft Exchange Server 2016 Cumulative Update 23",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "15.01.2507.075",
                "status": "affected",
                "version": "15.01.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Microsoft Exchange Server 2019 Cumulative Update 14",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "15.02.1544.048",
                "status": "affected",
                "version": "15.02.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Microsoft Exchange Server 2019 Cumulative Update 15",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "15.02.1748.053",
                "status": "affected",
                "version": "15.02.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Microsoft Exchange Server Subscription Edition RTM",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "15.02.2562.053",
                "status": "affected",
                "version": "15.02.0.0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "secure@microsoft.com"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate privileges over a network."
      }
    ],
    "id": "CVE-2026-96940",
    "lastModified": "2026-10-02T21:16:58.060",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
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            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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          "impactScore": 5.9,
          "source": "secure@microsoft.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
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          "ssvcData": {
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    "published": "2026-10-02T19:16:43.023",
    "references": [
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        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96940"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
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        "description": [
          {
            "lang": "en",
            "value": "CWE-1390"
          }
        ],
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}

Text

Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate privileges over a network.