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TI-2026-73392 Aliases CVE-2026-108131GHSA-fhqq-2fpf-qcf9

Active Directory Federation Services (AD FS) Spoofing Vulnerability

Priority MEDIUM 42CWE-295Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Spoofing
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Microsoft. Impact type from Microsoft.

Summary

Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network. The weaknesses are CWE-295 (Improper Certificate Validation) and CWE-290 (Authentication Bypass by Spoofing). CVSS 3.1 scores it 7.5 (HIGH) and requires no privileges or user interaction. CISA has not added it to KEV, and Microsoft reports no exploitation or public disclosure.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00865 58th percentileScored 2026-11-07
Fix Fixed Microsoft: 10 updates

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftWindows 10 Version 160710.0.14393.0 to before 10.0.14393.961210.0.14393.9612Patch availableCNA
MicrosoftWindows 10 Version 180910.0.17763.0 to before 10.0.17763.937610.0.17763.9376Patch availableCNA
MicrosoftWindows 10 Version 21H210.0.19044.0 to before 10.0.19044.780710.0.19044.7807Patch availableCNA
MicrosoftWindows 10 Version 22H210.0.19045.0 to before 10.0.19045.780710.0.19045.7807Patch availableCNA
MicrosoftWindows 11 version 23H210.0.22631.0 to before 10.0.22631.765210.0.22631.7652Patch availableCNA
MicrosoftWindows 11 Version 23H210.0.22631.0 to before 10.0.22631.765210.0.22631.7652Patch availableCNA
MicrosoftWindows 11 Version 24H210.0.26100.0 to before 10.0.26100.971110.0.26100.9711Patch availableCNA
MicrosoftWindows 11 Version 25H210.0.26200.0 to before 10.0.26200.971110.0.26200.9711Patch availableCNA
MicrosoftWindows 11 version 26H110.0.28000.0 to before 10.0.28000.323110.0.28000.3231Patch availableCNA
MicrosoftWindows 11 Version 26H210.0.26300.0 to before 10.0.26300.971110.0.26300.9711Patch availableCNA
MicrosoftWindows Server 20126.2.9200.0 to before 6.2.9200.264346.2.9200.26434Patch availableCNA
MicrosoftWindows Server 2012 (Server Core installation)6.2.9200.0 to before 6.2.9200.264346.2.9200.26434Patch availableCNA
MicrosoftWindows Server 2012 R26.3.9600.0 to before 6.3.9600.234706.3.9600.23470Patch availableCNA
MicrosoftWindows Server 2012 R2 (Server Core installation)6.3.9600.0 to before 6.3.9600.234706.3.9600.23470Patch availableCNA
MicrosoftWindows Server 201610.0.14393.0 to before 10.0.14393.961210.0.14393.9612Patch availableCNA
MicrosoftWindows Server 2016 (Server Core installation)10.0.14393.0 to before 10.0.14393.961210.0.14393.9612Patch availableCNA
MicrosoftWindows Server 201910.0.17763.0 to before 10.0.17763.937610.0.17763.9376Patch availableCNA
MicrosoftWindows Server 2019 (Server Core installation)10.0.17763.0 to before 10.0.17763.937610.0.17763.9376Patch availableCNA
MicrosoftWindows Server 202210.0.20348.0 to before 10.0.20348.576110.0.20348.5761Patch availableCNA
MicrosoftWindows Server 202510.0.26100.0 to before 10.0.26100.3365010.0.26100.33650Patch availableCNA
MicrosoftWindows Server 2025 (Server Core installation)10.0.26100.0 to before 10.0.26100.3365010.0.26100.33650Patch availableCNA
  • Windows 10 Version 1607 VendorMicrosoft Affected 10.0.14393.0 to before 10.0.14393.9612 Fixed in 10.0.14393.9612 Patch available CNA
  • Windows 10 Version 1809 VendorMicrosoft Affected 10.0.17763.0 to before 10.0.17763.9376 Fixed in 10.0.17763.9376 Patch available CNA
  • Windows 10 Version 21H2 VendorMicrosoft Affected 10.0.19044.0 to before 10.0.19044.7807 Fixed in 10.0.19044.7807 Patch available CNA
  • Windows 10 Version 22H2 VendorMicrosoft Affected 10.0.19045.0 to before 10.0.19045.7807 Fixed in 10.0.19045.7807 Patch available CNA
  • Windows 11 version 23H2 VendorMicrosoft Affected 10.0.22631.0 to before 10.0.22631.7652 Fixed in 10.0.22631.7652 Patch available CNA
  • Windows 11 Version 23H2 VendorMicrosoft Affected 10.0.22631.0 to before 10.0.22631.7652 Fixed in 10.0.22631.7652 Patch available CNA
  • Windows 11 Version 24H2 VendorMicrosoft Affected 10.0.26100.0 to before 10.0.26100.9711 Fixed in 10.0.26100.9711 Patch available CNA
  • Windows 11 Version 25H2 VendorMicrosoft Affected 10.0.26200.0 to before 10.0.26200.9711 Fixed in 10.0.26200.9711 Patch available CNA
  • Windows 11 version 26H1 VendorMicrosoft Affected 10.0.28000.0 to before 10.0.28000.3231 Fixed in 10.0.28000.3231 Patch available CNA
  • Windows 11 Version 26H2 VendorMicrosoft Affected 10.0.26300.0 to before 10.0.26300.9711 Fixed in 10.0.26300.9711 Patch available CNA
  • Windows Server 2012 VendorMicrosoft Affected 6.2.9200.0 to before 6.2.9200.26434 Fixed in 6.2.9200.26434 Patch available CNA
  • Windows Server 2012 (Server Core installation) VendorMicrosoft Affected 6.2.9200.0 to before 6.2.9200.26434 Fixed in 6.2.9200.26434 Patch available CNA
  • Windows Server 2012 R2 VendorMicrosoft Affected 6.3.9600.0 to before 6.3.9600.23470 Fixed in 6.3.9600.23470 Patch available CNA
  • Windows Server 2012 R2 (Server Core installation) VendorMicrosoft Affected 6.3.9600.0 to before 6.3.9600.23470 Fixed in 6.3.9600.23470 Patch available CNA
  • Windows Server 2016 VendorMicrosoft Affected 10.0.14393.0 to before 10.0.14393.9612 Fixed in 10.0.14393.9612 Patch available CNA
  • Windows Server 2016 (Server Core installation) VendorMicrosoft Affected 10.0.14393.0 to before 10.0.14393.9612 Fixed in 10.0.14393.9612 Patch available CNA
  • Windows Server 2019 VendorMicrosoft Affected 10.0.17763.0 to before 10.0.17763.9376 Fixed in 10.0.17763.9376 Patch available CNA
  • Windows Server 2019 (Server Core installation) VendorMicrosoft Affected 10.0.17763.0 to before 10.0.17763.9376 Fixed in 10.0.17763.9376 Patch available CNA
  • Windows Server 2022 VendorMicrosoft Affected 10.0.20348.0 to before 10.0.20348.5761 Fixed in 10.0.20348.5761 Patch available CNA
  • Windows Server 2025 VendorMicrosoft Affected 10.0.26100.0 to before 10.0.26100.33650 Fixed in 10.0.26100.33650 Patch available CNA
  • Windows Server 2025 (Server Core installation) VendorMicrosoft Affected 10.0.26100.0 to before 10.0.26100.33650 Fixed in 10.0.26100.33650 Patch available CNA

CPE names Threatist (inferred) · 3

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*——Microsoft
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:*:*——Microsoft
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*——Microsoft
  • cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:* Versions — — ·Microsoft
  • cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:*:* Versions — — ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:* Versions — — ·Microsoft

Remediation

Apply the Microsoft security update for your Windows version. Fixed builds are 10.0.14393.9612 (Windows 10 Version 1607, Windows Server 2016), 10.0.17763.9376 (Windows 10 Version 1809), 10.0.19044.7807 (Windows 10 Version 21H2), 10.0.19045.7807 (Windows 10 Version 22H2), 10.0.22631.7652 (Windows 11 Version 23H2), 10.0.26100.9711 (Windows 11 Version 24H2), 10.0.26200.9711 (Windows 11 Version 25H2), 10.0.26300.9711 (Windows 11 Version 26H2), 10.0.28000.3231 (Windows 11 Version 26H1), 6.2.9200.26434 (Windows Server 2012), and 6.3.9600.23470 (Windows Server 2012 R2). Builds before these are affected.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Microsoft 10 updates

  • KB5127648
    Security Update
    • Windows 11 Version 24H2 for ARM64-based Systems 10.0.26100.9711
    • Windows 11 Version 24H2 for x64-based Systems 10.0.26100.9711
    • Windows 11 Version 25H2 for ARM64-based Systems 10.0.26200.9711
    • Windows 11 Version 25H2 for x64-based Systems 10.0.26200.9711
    • Windows 11 Version 26H2 for ARM64-based Systems 10.0.26300.9711
    • Windows 11 Version 26H2 for x64-based Systems 10.0.26300.9711
  • KB5127646
    Security Update
    • Windows 11 Version 26H1 for ARM64-based Systems 10.0.28000.3231
    • Windows 11 version 26H1 for x64-based Systems 10.0.28000.3231
  • KB5126868
    Security Update
    • Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0
    • Windows 10 Version 1607 for 32-bit Systems 10.0.14393.9612
    • Windows 10 Version 1607 for x64-based Systems 10.0.14393.9612
    • Windows Server 2016 10.0.14393.9612
    • Windows Server 2016 (Server Core installation) 10.0.14393.9612
Show 7 more Microsoft updates
  • KB5126836
    Security Update
    • Windows Server 2012 R2 6.3.9600.23470
    • Windows Server 2012 R2 (Server Core installation) 6.3.9600.23470
  • KB5126835
    Security Update
    • Windows Server 2012 6.2.9200.26434
    • Windows Server 2012 (Server Core installation) 6.2.9200.26434
  • KB5126657
    Security Update
    • Windows 10 Version 21H2 for 32-bit Systems 10.0.19044.7807
    • Windows 10 Version 21H2 for ARM64-based Systems 10.0.19044.7807
    • Windows 10 Version 21H2 for x64-based Systems 10.0.19044.7807
    • Windows 10 Version 22H2 for 32-bit Systems 10.0.19044.7807, 10.0.19045.7807
    • Windows 10 Version 22H2 for ARM64-based Systems 10.0.19044.7807, 10.0.19045.7807
    • Windows 10 Version 22H2 for x64-based Systems 10.0.19044.7807, 10.0.19045.7807
  • KB5126655
    Security Update
    • Windows Server 2022 10.0.20348.5761
    • Windows Server 2022 (Server Core installation) 10.0.20348.5761
  • KB5126653
    Security Update
    • Windows 11 Version 23H2 for ARM64-based Systems 10.0.22631.7652
    • Windows 11 Version 23H2 for x64-based Systems 10.0.22631.7652
  • KB5126651
    Security Update
    • Windows 10 Version 1809 for 32-bit Systems 10.0.17763.9376
    • Windows 10 Version 1809 for x64-based Systems 10.0.17763.9376
    • Windows Server 2019 10.0.17763.9376
    • Windows Server 2019 (Server Core installation) 10.0.17763.9376
  • KB5126646
    Security Update
    • Windows Server 2025 10.0.26100.33650
    • Windows Server 2025 (Server Core installation) 10.0.26100.33650

Vendor assessments

Microsoft

Microsoft's page for this CVE →

Impact
Spoofing
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely

Timeline

  1. 2026-10-13 Threatist record created from CVE-2026-108131
  2. 2026-10-13 Alias added: GHSA-fhqq-2fpf-qcf9
  3. 2026-10-14 Priority changed: LOW → MEDIUM
  4. 2026-10-16 Weakness changed · CNA
  5. 2026-10-16 Fix available: KB5126646, KB5126651, KB5126653 +7 · Microsoft
  6. 2026-10-16 Fix available: Microsoft/Windows 10 Version [email protected] · CNA

References

Patch 1

  • TI-2026-42212 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-37256 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-26194 Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-16982 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-36863 Windows Server Update Service (WSUS) Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-33671 Microsoft SharePoint Server Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
See all 18045 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences