CVE-2026-96252: Active Directory Federation Services (AD FS) Spoofing Vulnerability
Active Directory Federation Services (AD FS) Spoofing Vulnerability
Other sources
Improper verification of cryptographic signature in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.9376Patch KB5126651 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.14393.9612Patch KB5126868 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5761Patch KB5126655 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.3.9600.23470Patch KB5126836 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.2.9200.26434Patch KB5126835
Event History
Frequently Asked Questions
Which systems should be prioritized for assessment?
Prioritize Microsoft Active Directory Federation Services deployments and the listed Windows Server versions: Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025. Microsoft Windows 10 is also listed as affected software.
Does exploitation require authentication or user interaction?
No. The supplied severity vector indicates network-based exploitation with low attack complexity, no privileges required, and no user interaction required.
What security impact could successful exploitation have?
Successful exploitation can allow spoofing and is rated as having high confidentiality and integrity impact. The supplied vector indicates no availability impact.