Description
Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.
CISA Known Exploited Vulnerability
Date added 2026-07-14 | Due date 2026-07-28
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.
Problem types
CWE-1220: Insufficient Granularity of Access Control
Product status
References
www.cisa.gov/...erabilities-catalog?field_cve=CVE-2026-56155
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56155 (Active Directory Federation Services Elevation of Privilege Vulnerability)