CVE-2026-50324

Windows Active Directory Federation Services Denial of Service Vulnerability

State: Published
Severity: 5.9 Medium
Published: Jul 14, 2026
Updated: Nov 1, 2026
Reserved: Jun 4, 2026

Description

Loop with unreachable exit condition ('infinite loop') in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.

Scores

CVSS	Score	Vector	Source
3.1	5.9 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')

Affected Products

Product	Versions
Microsoft .NET Framework 3.5 AND 4.7.2Microsoft	4.7.0 to before 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0Affected
Microsoft .NET Framework 3.5 AND 4.8Microsoft	4.8.0 to before 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0Affected
Microsoft .NET Framework 3.5 AND 4.8.1Microsoft	4.8.1 to before 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0Affected
Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2Microsoft	4.7.0 to before 4.7.4143.0Affected
Microsoft .NET Framework 4.8Microsoft	4.8.0 to before 4.8.4803.0Affected
Microsoft .NET Framework 4.8.1Microsoft	4.8.0.0 to before 4.8.9340.0Affected
Windows 10 Version 1607Microsoft	10.0.14393.0 to before 10.0.14393.9339Affected
Windows 10 Version 1809Microsoft	10.0.17763.0 to before 10.0.17763.9020Affected
Windows Server 2012 R2Microsoft	6.3.9600.0 to before 6.3.9600.23291Affected
Windows Server 2012 R2 (Server Core installation)Microsoft	6.3.9600.0 to before 6.3.9600.23291Affected
Windows Server 2016Microsoft	10.0.14393.0 to before 10.0.14393.9339Affected
Windows Server 2016 (Server Core installation)Microsoft	10.0.14393.0 to before 10.0.14393.9339Affected
Windows Server 2019Microsoft	10.0.17763.0 to before 10.0.17763.9020Affected
Windows Server 2019 (Server Core installation)Microsoft	10.0.17763.0 to before 10.0.17763.9020Affected
Windows Server 2022Microsoft	10.0.20348.0 to before 10.0.20348.5386Affected
Windows Server 2025Microsoft	10.0.26100.0 to before 10.0.26100.33158Affected
Windows Server 2025 (Server Core installation)Microsoft	10.0.26100.0 to before 10.0.26100.33158Affected

References

Windows Active Directory Federation Services Denial of Service Vulnerabilityvendor-advisorypatch

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