CVE-2026-96222

Active Directory Federation Services (AD FS) Spoofing Vulnerability

State: Published
Severity: 7.4 High
Published: Oct 13, 2026
Updated: Oct 31, 2026
Reserved: Sep 22, 2026

Description

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

Scores

CVSS	Score	Vector	Source
3.1	7.4 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-295 Improper Certificate Validation

Affected Products

Product	Versions
Microsoft .NET Framework 3.5Microsoft	3.5.0 to before 2.0.50727.9188 AND 3.0.30729.9171Affected
Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2Microsoft	3.0.0.0 to before 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0Affected
Microsoft .NET Framework 3.5 AND 4.7.2Microsoft	4.7.0 to before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0Affected
Microsoft .NET Framework 3.5 AND 4.8Microsoft	4.8.0 to before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0Affected
Microsoft .NET Framework 3.5 AND 4.8.1Microsoft	4.8.1 to before 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0Affected
Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2Microsoft	4.7.0 to before 4.7.4150.0Affected
Microsoft .NET Framework 4.8Microsoft	4.8.0 to before 4.8.4811.0Affected
Microsoft .NET Framework 4.8.1Microsoft	4.8.0.0 to before 4.8.9363.0Affected
Microsoft Visual Studio 2022 version 17.14Microsoft	17.14.0 to before 17.14.42Affected
Microsoft Visual Studio 2026 version 18.10Microsoft	18.10.0 to before 18.10.4Affected
System.Security.Cryptography.XmlMicrosoft	10.0.0 to before 8.0.5Affected
Windows 10 Version 1607Microsoft	10.0.14393.0 to before 10.0.14393.9612Affected
Windows 10 Version 1809Microsoft	10.0.17763.0 to before 10.0.17763.9376Affected
Windows Server 2012 R2Microsoft	6.3.9600.0 to before 6.3.9600.23470Affected
Windows Server 2012 R2 (Server Core installation)Microsoft	6.3.9600.0 to before 6.3.9600.23470Affected
Windows Server 2016Microsoft	10.0.14393.0 to before 10.0.14393.9612Affected
Windows Server 2016 (Server Core installation)Microsoft	10.0.14393.0 to before 10.0.14393.9612Affected
Windows Server 2019Microsoft	10.0.17763.0 to before 10.0.17763.9376Affected
Windows Server 2019 (Server Core installation)Microsoft	10.0.17763.0 to before 10.0.17763.9376Affected
Windows Server 2022Microsoft	10.0.20348.0 to before 10.0.20348.5761Affected
Windows Server 2025Microsoft	10.0.26100.0 to before 10.0.26100.33650Affected
Windows Server 2025 (Server Core installation)Microsoft	10.0.26100.0 to before 10.0.26100.33650Affected

References

Active Directory Federation Services (AD FS) Spoofing Vulnerabilityvendor-advisorypatch

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