CVE-2026-56155

HIGH7.8

CISA KEV

Published 2026-07-14 · Updated 2026-07-14 · Source secure@microsoft.com

Description

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

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-1220

CISA Known-Exploited Vulnerability

Product: Microsoft — Active Directory Federation Services

Name: Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability

Date added: 2026-07-14 · Due: 2026-07-28

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.

References

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