Active Directory Federation Services (AD FS) Spoofing Vulnerability

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-96222
StatePUBLISHED
Assignermicrosoft
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-13 19:21:48 UTC
Updated2026-10-20 00:34:26 UTC
DescriptionImproper certificate validation in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.

Risk And Classification

Primary CVSS: v3.1 7.4 HIGH from [email protected]

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

Problem Types: CWE-295 | CWE-295 CWE-295: Improper Certificate Validation

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNACVSS7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Apple Macos - All All All
Operating System Linux Linux Kernel - All All All
Application Microsoft .net All All All All
Application Microsoft .net Framework 4.6.2 All All All
Application Microsoft .net Framework 4.7 All All All
Application Microsoft .net Framework 4.7.1 All All All
Application Microsoft .net Framework 4.7.2 All All All
Application Microsoft .net Framework 4.8 All All All
Application Microsoft .net Framework 4.8.1 All All All
Application Microsoft Visual Studio 2022 All All All All
Application Microsoft Visual Studio 2026 All All All All
Operating System Microsoft Windows - All All All
Operating System Microsoft Windows 10 1607 - All All All
Operating System Microsoft Windows 10 1607 All All All All
Operating System Microsoft Windows 10 1607 All All All All
Operating System Microsoft Windows 10 1809 All All All All
Operating System Microsoft Windows 10 1809 All All All All
Operating System Microsoft Windows 11 26h1 - All All All
Operating System Microsoft Windows 11 26h1 - All All All
Operating System Microsoft Windows Server 2012 - All All All
Operating System Microsoft Windows Server 2012 r2 All All All
Operating System Microsoft Windows Server 2012 - All All All
Operating System Microsoft Windows Server 2012 r2 All All All
Operating System Microsoft Windows Server 2016 - All All All
Operating System Microsoft Windows Server 2016 All All All All
Operating System Microsoft Windows Server 2019 All All All All
Operating System Microsoft Windows Server 2022 All All All All
Operating System Microsoft Windows Server 2025 All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Microsoft Microsoft .NET Framework 3.5 affected 3.5.0 2.0.50727.9188 AND 3.0.30729.9171 custom Windows 11 version 26H1, Windows Server 2012, Windows Server 2012 R2
CNA Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 affected 3.0.0.0 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0 custom Windows 10 version 1607, Windows Server 2016, Windows Server 2019
CNA Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 affected 4.7.0 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 custom Windows 10 version 1809
CNA Microsoft Microsoft .NET Framework 3.5 AND 4.8 affected 4.8.0 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 custom Windows 10 version 1809, Windows 10 version 21H2, Windows 10 version 22H2, Windows Server 2019, Windows Server 2022
CNA Microsoft Microsoft .NET Framework 3.5 AND 4.8.1 affected 4.8.1 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 custom Windows 10 version 21H2, Windows 10 version 22H2, Windows 11 version 23H2, Windows 11 version 24H2, Windows 11 version 25H2, Windows 11 version 26H2, Windows Server 2022, Windows Server 2025
CNA Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 affected 4.7.0 4.7.4150.0 custom Windows Server 2012, Windows Server 2012 R2
CNA Microsoft Microsoft .NET Framework 4.8 affected 4.8.0 4.8.4811.0 custom Windows 10 version 1607, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016
CNA Microsoft Microsoft .NET Framework 4.8.1 affected 4.8.0.0 4.8.9363.0 custom Windows 11 version 26H1
CNA Microsoft Microsoft Visual Studio 2022 Version 17.14 affected 17.14.0 17.14.42 custom Not specified
CNA Microsoft Microsoft Visual Studio 2026 Version 18.10 affected 18.10.0 18.10.4 custom Not specified
CNA Microsoft System.Security.Cryptography.Xml affected 10.0.0 8.0.5 custom .NET 8.0 installed on Linux, .NET 8.0 installed on Mac OS, .NET 8.0 installed on Windows
CNA Microsoft Windows 10 Version 1607 affected 10.0.14393.0 10.0.14393.9612 custom 32-bit Systems, x64-based Systems
CNA Microsoft Windows 10 Version 1809 affected 10.0.17763.0 10.0.17763.9376 custom 32-bit Systems, x64-based Systems
CNA Microsoft Windows Server 2012 R2 affected 6.3.9600.0 6.3.9600.23470 custom x64-based Systems
CNA Microsoft Windows Server 2012 R2 Server Core Installation affected 6.3.9600.0 6.3.9600.23470 custom x64-based Systems
CNA Microsoft Windows Server 2016 affected 10.0.14393.0 10.0.14393.9612 custom x64-based Systems
CNA Microsoft Windows Server 2016 Server Core Installation affected 10.0.14393.0 10.0.14393.9612 custom x64-based Systems
CNA Microsoft Windows Server 2019 affected 10.0.17763.0 10.0.17763.9376 custom x64-based Systems
CNA Microsoft Windows Server 2019 Server Core Installation affected 10.0.17763.0 10.0.17763.9376 custom x64-based Systems
CNA Microsoft Windows Server 2022 affected 10.0.20348.0 10.0.20348.5761 custom x64-based Systems
CNA Microsoft Windows Server 2025 affected 10.0.26100.0 10.0.26100.33650 custom x64-based Systems
CNA Microsoft Windows Server 2025 Server Core Installation affected 10.0.26100.0 10.0.26100.33650 custom x64-based Systems

References

ReferenceSourceLinkTags
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96222 [email protected] msrc.microsoft.com Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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