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CVE-2026-56155: Active Directory Federation Services Elevation of Privilege Vulnerability

High · CVSS 7.8 (CVSS 3.1)KEV known exploitedEPSS 0.35%, 28th percentilePublished Updated Assigner: microsoft

In CISA’s Known Exploited Vulnerabilities catalog: Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability .

Added , federal remediation due . Known ransomware use: Unknown.

Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Description

Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.

Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C · CWE-1220

Status incidents that name it

No tracked status incident names this CVE.

Affected vendors and products

Microsoft: Windows 10 Version 1607Microsoft: Windows 10 Version 1809Microsoft: Windows Server 2012Microsoft: Windows Server 2012 R2Microsoft: Windows Server 2012 R2 (Server Core installation)Microsoft: Windows Server 2012 (Server Core installation)Microsoft: Windows Server 2016Microsoft: Windows Server 2016 (Server Core installation)Microsoft: Windows Server 2019Microsoft: Windows Server 2019 (Server Core installation)Microsoft: Windows Server 2022Microsoft: Windows Server 2025Microsoft: Windows Server 2025 (Server Core installation)

References

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