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CVE-2026-96222

7.4 high SSVC exploitation: none Analyzed
NVD · CVE.org

Improper certificate validation in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.

Fix

Microsoft's update · Critical

  • Release Notes — System.Security.Cryptography.Xml on .NET 8.0 runtime installed on Windows, System.Security.Cryptography.Xml on .NET 8.0 runtime installed on Linux, System.Security.Cryptography.Xml on .NET 8.0 runtime installed on Mac OS · build 8.0.5
  • KB5126651 — Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809, Windows Server 2019, Windows Server 2019 (Server Core installation) · build 10.0.17763.9376 · restart required
  • KB5126655 — Windows Server 2022, Windows Server 2022 (Server Core installation) · build 10.0.20348.5761 · restart required
  • KB5126646 — Windows Server 2025 (Server Core installation), Windows Server 2025 · build 10.0.26100.33650 · restart required
  • KB5126868 — Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607, Windows Server 2016, Windows Server 2016 (Server Core installation) · build 10.0.14393.9612 · restart required
  • KB5126836 — Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation) · build 6.3.9600.23470 · restart required
  • Release Notes — Microsoft Visual Studio 2026 version 18.10 · build 18.10.4 · restart required
  • Release Notes — Microsoft Visual Studio 2022 version 17.14 · build 17.14.42 · restart required
  • KB5127689 — Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 22H2 · build 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
  • KB5127690 — Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 24H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 25H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025 · build 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
  • KB5127691 — Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1 · build 4.8.9363.0
  • KB5127692 — Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 23H2 · build 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
  • KB5127693 — Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022 · build 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
  • KB5127694 — Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H2 · build 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.10008.0
  • KB5127696 — Microsoft .NET Framework 3.5 on Windows 11 version 26H1 · build 2.0.50727.9188 AND 3.0.30729.9171
  • KB5127660 — Microsoft .NET Framework 3.5 on Windows Server 2012 · build 2.0.50727.8987 AND 3.0.30729.8982
  • KB5127664 — Microsoft .NET Framework 3.5 on Windows Server 2012 R2 · build 2.0.50727.8987 AND 3.0.30729.8982
  • KB5126868 — Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 version 1607, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 · build 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0
  • KB5127666 — Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2019, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 version 1809 · build 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0
  • KB5127685 — Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 1809, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 · build 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0
  • KB5127683 — Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 22H2 · build 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.4811.0
  • KB5127687 — Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022 · build 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.4811.0
  • KB5127667 — Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 · build 4.7.4150.0
  • KB5127668 — Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 · build 4.7.4150.0

From the 2026-Oct release note of Microsoft's Security Update Guide, revised 2026-10-28 · Exploitation Less Likely.

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 4

  1. Cpes+20 CPE criteria (now 20)NVD modified 2026-10-20 00:34
  2. StatusPublished → AnalyzedNVD modified 2026-10-20 00:34
  3. StatusAwaiting Analysis → PublishedNVD modified 2026-10-19 19:36
  4. First seenCVSS 7.4NVD modified 2026-10-14 04:18

Affected (CPE criteria) 20

  • cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
  • cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
  • cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
  • cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
  • cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
  • cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
  • cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:x64:*
  • cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:x64:*
  • cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:x64:*
  • cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:*
  • cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:-:*:*
  • cpe:2.3:a:microsoft:visual_studio_2026:*:*:*:*:*:-:*:*
  • cpe:2.3:a:microsoft:.net_framework:4.8.1:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net_framework:4.8:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net_framework:4.6.2:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net_framework:4.7:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net_framework:4.7.1:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net_framework:4.7.2:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net_framework:3.5:*:*:*:*:*:*:*

References 1