Untrusted pointer dereference in Windows Failover Cluster allows an unauthorized attacker to execute code over a network.

cve CVE-2026-78444 1 source, 1 claim · Watch

NVD writes:
Untrusted pointer dereference in Windows Failover Cluster allows an unauthorized attacker to execute code over a network. the claim

Severity: HIGH NVD
CVSS: 8.1 NVD
Fixed in: 10.0.17763.9245, 10.0.20348.5622, 10.0.26100.33438 NVD
Vendor: Microsoft NVD
Product: Windows 10 Version 1809 NVD
CWE: CWE-822 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: Untrusted pointer dereference in Windows Failover Cluster allows an unauthorized attacker to execute code over a network.

NVD

What it is to other things

affects	microsoft/windows_10_1809 NVD
affects	microsoft/windows_server_2019 NVD
affects	microsoft/windows_server_2022 NVD
affects	microsoft/windows_server_2025 NVD
made_by	microsoft NVD

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

affects

microsoft/windows_10_version_1809

NVD says “Microsoft · Windows 10 Version 1809”

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

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Windows 10 Version 1809",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2019",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2019 (Server Core installation)",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2022",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.20348.5622",
                "status": "affected",
                "version": "10.0.20348.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2025",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.26100.33438",
                "status": "affected",
                "version": "10.0.26100.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2025 (Server Core installation)",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.26100.33438",
                "status": "affected",
                "version": "10.0.26100.0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "secure@microsoft.com"
      }
    ],
    "configurations": [
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        "nodes": [
          {
            "cpeMatch": [
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                "vulnerable": true
              },
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    "cveTags": [],
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        "value": "Untrusted pointer dereference in Windows Failover Cluster allows an unauthorized attacker to execute code over a network."
      }
    ],
    "id": "CVE-2026-78444",
    "lastModified": "2026-09-11T21:17:16.287",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 5.9,
          "source": "secure@microsoft.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-78444",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-11T20:44:28.410249Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-08T18:20:42.133",
    "references": [
      {
        "source": "secure@microsoft.com",
        "tags": [
          "Patch",
          "Vendor Advisory"
        ],
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78444"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-822"
          }
        ],
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}

—

CVSS

cvss

NVD

8.1

receipt

Source: NVD
Its words: 8.1
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": {
    "affected": [
      {
        "affectedData": [
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Windows 10 Version 1809",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2019",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2019 (Server Core installation)",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2022",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.20348.5622",
                "status": "affected",
                "version": "10.0.20348.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2025",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.26100.33438",
                "status": "affected",
                "version": "10.0.26100.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2025 (Server Core installation)",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.26100.33438",
                "status": "affected",
                "version": "10.0.26100.0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "secure@microsoft.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*",
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                "versionEndExcluding": "10.0.17763.9245",
                "vulnerable": true
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                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*",
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                "vulnerable": true
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            "negate": false,
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    "cveTags": [],
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      }
    ],
    "id": "CVE-2026-78444",
    "lastModified": "2026-09-11T21:17:16.287",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 5.9,
          "source": "secure@microsoft.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-78444",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
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            "role": "CISA Coordinator",
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            "version": "2.0.3"
          }
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      ]
    },
    "published": "2026-09-08T18:20:42.133",
    "references": [
      {
        "source": "secure@microsoft.com",
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        ],
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78444"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
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          {
            "lang": "en",
            "value": "CWE-822"
          }
        ],
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}

—

CVSS vector

cvss_vector

NVD

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

receipt

Source: NVD
Its words: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Windows 10 Version 1809",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2019",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2019 (Server Core installation)",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2022",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.20348.5622",
                "status": "affected",
                "version": "10.0.20348.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2025",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.26100.33438",
                "status": "affected",
                "version": "10.0.26100.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2025 (Server Core installation)",
            "vendor": "Microsoft",
            "versions": [
              {
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                "status": "affected",
                "version": "10.0.26100.0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "secure@microsoft.com"
      }
    ],
    "configurations": [
      {
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          {
            "cpeMatch": [
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                "versionEndExcluding": "10.0.17763.9245",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*",
                "matchCriteriaId": "D5E29D31-09E1-4C19-AAB0-191AA960C778",
                "versionEndExcluding": "10.0.17763.9245",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*",
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                "vulnerable": true
              },
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                "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "48D75543-6B91-41E9-A1FB-1A09A2CBD738",
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                "vulnerable": true
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            ],
            "negate": false,
            "operator": "OR"
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    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Untrusted pointer dereference in Windows Failover Cluster allows an unauthorized attacker to execute code over a network."
      }
    ],
    "id": "CVE-2026-78444",
    "lastModified": "2026-09-11T21:17:16.287",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 5.9,
          "source": "secure@microsoft.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
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            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
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            "role": "CISA Coordinator",
            "timestamp": "2026-09-11T20:44:28.410249Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-08T18:20:42.133",
    "references": [
      {
        "source": "secure@microsoft.com",
        "tags": [
          "Patch",
          "Vendor Advisory"
        ],
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78444"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-822"
          }
        ],
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}

—

CWE

cwe

NVD

CWE-822

receipt

Source: NVD
Its words: CWE-822
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-822
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Windows 10 Version 1809",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2019",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2019 (Server Core installation)",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
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              "x64-based Systems"
            ],
            "product": "Windows Server 2022",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.20348.5622",
                "status": "affected",
                "version": "10.0.20348.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2025",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.26100.33438",
                "status": "affected",
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            ]
          },
          {
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            ],
            "product": "Windows Server 2025 (Server Core installation)",
            "vendor": "Microsoft",
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                "versionType": "custom"
              }
            ]
          }
        ],
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      }
    ],
    "configurations": [
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            "version": "3.1"
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          "impactScore": 5.9,
          "source": "secure@microsoft.com",
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        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
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            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-11T20:44:28.410249Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-08T18:20:42.133",
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      {
        "source": "secure@microsoft.com",
        "tags": [
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        ],
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78444"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-822"
          }
        ],
        "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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  "cve": {
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      {
        "affectedData": [
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Windows 10 Version 1809",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2019",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2019 (Server Core installation)",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
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              }
            ]
          },
          {
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              "x64-based Systems"
            ],
            "product": "Windows Server 2022",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.20348.5622",
                "status": "affected",
                "version": "10.0.20348.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2025",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.26100.33438",
                "status": "affected",
                "version": "10.0.26100.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2025 (Server Core installation)",
            "vendor": "Microsoft",
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              {
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                "status": "affected",
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            "options": [
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                "exploitation": "none"
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    },
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    ],
    "sourceIdentifier": "secure@microsoft.com",
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            "value": "CWE-822"
          }
        ],
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}

—

Fixed in

fixed_in

NVD

10.0.17763.9245, 10.0.20348.5622, 10.0.26100.33438

receipt

Source: NVD
Its words: 10.0.17763.9245, 10.0.20348.5622, 10.0.26100.33438
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	10.0.17763.9245, 10.0.20348.5622, 10.0.26100.33438
2026-09-29 09:45 UTC	—

What the source handed over

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    "affected": [
      {
        "affectedData": [
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Windows 10 Version 1809",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
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            ],
            "product": "Windows Server 2019",
            "vendor": "Microsoft",
            "versions": [
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                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2019 (Server Core installation)",
            "vendor": "Microsoft",
            "versions": [
              {
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                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2022",
            "vendor": "Microsoft",
            "versions": [
              {
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                "status": "affected",
                "version": "10.0.20348.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2025",
            "vendor": "Microsoft",
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                "status": "affected",
                "version": "10.0.26100.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
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                "versionType": "custom"
              }
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          }
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    ],
    "configurations": [
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    "lastModified": "2026-09-11T21:17:16.287",
    "metrics": {
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            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 5.9,
          "source": "secure@microsoft.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-78444",
            "options": [
              {
                "exploitation": "none"
              },
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                "automatable": "no"
              },
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                "technicalImpact": "total"
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    },
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    "references": [
      {
        "source": "secure@microsoft.com",
        "tags": [
          "Patch",
          "Vendor Advisory"
        ],
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78444"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-822"
          }
        ],
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}

—

Product

product

NVD

Windows 10 Version 1809

receipt

Source: NVD
Its words: Windows 10 Version 1809
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	Windows 10 Version 1809
2026-09-29 09:45 UTC	—

What the source handed over

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  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Windows 10 Version 1809",
            "vendor": "Microsoft",
            "versions": [
              {
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                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2019",
            "vendor": "Microsoft",
            "versions": [
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                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2019 (Server Core installation)",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2022",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.20348.5622",
                "status": "affected",
                "version": "10.0.20348.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2025",
            "vendor": "Microsoft",
            "versions": [
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            ]
          },
          {
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            ],
            "product": "Windows Server 2025 (Server Core installation)",
            "vendor": "Microsoft",
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                "status": "affected",
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                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "secure@microsoft.com"
      }
    ],
    "configurations": [
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              {
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            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Untrusted pointer dereference in Windows Failover Cluster allows an unauthorized attacker to execute code over a network."
      }
    ],
    "id": "CVE-2026-78444",
    "lastModified": "2026-09-11T21:17:16.287",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 5.9,
          "source": "secure@microsoft.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-78444",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-11T20:44:28.410249Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-08T18:20:42.133",
    "references": [
      {
        "source": "secure@microsoft.com",
        "tags": [
          "Patch",
          "Vendor Advisory"
        ],
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78444"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-822"
          }
        ],
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}

—

Severity

severity

NVD

HIGH

From 7.0 to 8.9.

receipt

Source: NVD
Its words: HIGH
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	HIGH
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Windows 10 Version 1809",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2019",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2019 (Server Core installation)",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2022",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.20348.5622",
                "status": "affected",
                "version": "10.0.20348.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2025",
            "vendor": "Microsoft",
            "versions": [
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                "lessThan": "10.0.26100.33438",
                "status": "affected",
                "version": "10.0.26100.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
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            ],
            "product": "Windows Server 2025 (Server Core installation)",
            "vendor": "Microsoft",
            "versions": [
              {
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                "status": "affected",
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                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "secure@microsoft.com"
      }
    ],
    "configurations": [
      {
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          {
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              {
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              {
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              },
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    ],
    "cveTags": [],
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    "lastModified": "2026-09-11T21:17:16.287",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 5.9,
          "source": "secure@microsoft.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-78444",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-11T20:44:28.410249Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-08T18:20:42.133",
    "references": [
      {
        "source": "secure@microsoft.com",
        "tags": [
          "Patch",
          "Vendor Advisory"
        ],
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78444"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-822"
          }
        ],
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}

high

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": "Windows 10 Version 1809",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2019",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2019 (Server Core installation)",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2022",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.20348.5622",
                "status": "affected",
                "version": "10.0.20348.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2025",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.26100.33438",
                "status": "affected",
                "version": "10.0.26100.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2025 (Server Core installation)",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.26100.33438",
                "status": "affected",
                "version": "10.0.26100.0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "secure@microsoft.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
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                "matchCriteriaId": "81786843-7838-4C74-AEA6-E64B6B354387",
                "versionEndExcluding": "10.0.17763.9245",
                "vulnerable": true
              },
              {
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                "matchCriteriaId": "D5E29D31-09E1-4C19-AAB0-191AA960C778",
                "versionEndExcluding": "10.0.17763.9245",
                "vulnerable": true
              },
              {
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              {
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                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*",
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              }
            ],
            "negate": false,
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        ]
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    ],
    "cveTags": [],
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      {
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      }
    ],
    "id": "CVE-2026-78444",
    "lastModified": "2026-09-11T21:17:16.287",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 5.9,
          "source": "secure@microsoft.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-78444",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-11T20:44:28.410249Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-08T18:20:42.133",
    "references": [
      {
        "source": "secure@microsoft.com",
        "tags": [
          "Patch",
          "Vendor Advisory"
        ],
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78444"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-822"
          }
        ],
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}

—

Technical impact

technical_impact

NVD

total

The attacker gains full control of the component, or all of its information.

receipt

Source: NVD
Its words: total
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	total
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Windows 10 Version 1809",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2019",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2019 (Server Core installation)",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.17763.9245",
                "status": "affected",
                "version": "10.0.17763.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2022",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.20348.5622",
                "status": "affected",
                "version": "10.0.20348.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2025",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.26100.33438",
                "status": "affected",
                "version": "10.0.26100.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2025 (Server Core installation)",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.26100.33438",
                "status": "affected",
                "version": "10.0.26100.0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "secure@microsoft.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*",
                "matchCriteriaId": "81786843-7838-4C74-AEA6-E64B6B354387",
                "versionEndExcluding": "10.0.17763.9245",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*",
                "matchCriteriaId": "D5E29D31-09E1-4C19-AAB0-191AA960C778",
                "versionEndExcluding": "10.0.17763.9245",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "14138B1B-9554-4B1D-84C6-485FB9763DA4",
                "versionEndExcluding": "10.0.17763.9245",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*",
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                "versionEndExcluding": "10.0.20348.5622",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "48D75543-6B91-41E9-A1FB-1A09A2CBD738",
                "versionEndExcluding": "10.0.26100.33438",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Untrusted pointer dereference in Windows Failover Cluster allows an unauthorized attacker to execute code over a network."
      }
    ],
    "id": "CVE-2026-78444",
    "lastModified": "2026-09-11T21:17:16.287",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 5.9,
          "source": "secure@microsoft.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-78444",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-11T20:44:28.410249Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-08T18:20:42.133",
    "references": [
      {
        "source": "secure@microsoft.com",
        "tags": [
          "Patch",
          "Vendor Advisory"
        ],
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78444"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-822"
          }
        ],
        "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

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "platforms": [
              "32-bit Systems",
              "x64-based Systems"
            ],
            "product": "Windows 10 Version 1809",
            "vendor": "Microsoft",
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            "role": "CISA Coordinator",
            "timestamp": "2026-09-11T20:44:28.410249Z",
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        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78444"
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    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Analyzed",
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            "value": "CWE-822"
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        "type": "Secondary"
      }
    ]
  }
}

—

Every claim, by kind

vulnerability

Untrusted pointer dereference in Windows Failover Cluster allows an unauthorized attacker to execute code over a network.

zetlyn/cve-nvd · 2026-09-08

automatable no cvss 8.1 cvss_vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H cwe CWE-822 exploitation none fixed_in 10.0.17763.9245, 10.0.20348.5622, 10.0.26100.33438 product Windows 10 Version 1809 severity HIGH status Analyzed technical_impact total vendor Microsoft

source