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Findings

CVE-2026-108131

Active Directory Federation Services (AD FS) Spoofing Vulnerability

Published Oct 13, 2026 · updated Oct 14, 2026 · Microsoft Windows

Affected Microsoft products: Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 23H2 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems, Windows 11 Version 26H1 for ARM64-based Systems, Windows Server 2025 (Server Core installation), Windows Server 2025, Windows 11 Version 26H2 for x64-based Systems, Windows 11 Version 24H2 for ARM64-based Systems.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2026 · CIRCL Vulnerability Lookup

    Detected

    No cwe for this issue in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.

  2. Oct 14, 2026 · CIRCL Vulnerability Lookup

    Updated

    No cwe for this issue in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.

Affected

  • microsoft Windows 11 Version 23H2 for ARM64-based Systemsversion unspecified
  • microsoft Windows 11 Version 24H2 for ARM64-based Systemsversion unspecified
  • microsoft Windows 11 Version 24H2 for x64-based Systemsversion unspecified
  • microsoft Windows 11 Version 25H2 for ARM64-based Systemsversion unspecified
  • microsoft Windows 11 Version 25H2 for x64-based Systemsversion unspecified
  • microsoft Windows 11 Version 26H1 for ARM64-based Systemsversion unspecified
  • microsoft Windows 11 Version 26H2 for ARM64-based Systemsversion unspecified
  • microsoft Windows 11 Version 26H2 for x64-based Systemsversion unspecified
  • microsoft Windows 11 version 26H1 for x64-based Systemsversion unspecified
  • microsoft Windows Server 2022version unspecified
  • microsoft Windows Server 2025version unspecified
  • microsoft Windows Server 2025 (Server Core installation)version unspecified
  • vendor Microsoft Windows 10 Version 1607version unspecified
  • vendor Microsoft Windows 10 Version 1809version unspecified
  • vendor Microsoft Windows 10 Version 21H2version unspecified
  • vendor Microsoft Windows 10 Version 22H2version unspecified
  • vendor Microsoft Windows 11 Version 23H2version unspecified
  • vendor Microsoft Windows 11 Version 24H2version unspecified
  • vendor Microsoft Windows 11 Version 25H2version unspecified
  • vendor Microsoft Windows 11 version 23H2version unspecified

Sources

  • CIRCL Vulnerability LookupVulnerability recordCVE-2026-108131

    No cwe for this issue in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.

    vulnerability.circl.lu
  • CVE.orgVulnerability recordCVE-2026-108131

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-108131

    30-day exploitation probability 0.7%

    first.org
  • Microsoft Security Update GuideVendor advisoryCVE-2026-108131

    Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 23H2 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems, Windows 11 Version 26H1 for ARM64-based Systems

    msrc.microsoft.com

References