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CVE-2026-56155

Microsoft · Active Directory Federation Services · Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability

Published · Added to CISA KEV
CVSS7.8
Severityhigh
WeaknessCWE-1220
ExploitedYes, in CISA KEV
Ransomware useUnknown
Federal fix dueJul 28, 2026

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

Description

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

Required action (CISA)

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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Our coverage of CVE-2026-56155

CVE-2008-4128high

July 2026 CVE Landscape

In July 2026, a significant increase in high-impact vulnerabilities was observed, with 85 critical flaws identified, 36 of which had a Very Critical Recorded Future Risk Score. A notable portion of these vulnerabilities were either already listed in CISA's Known Exploited Vulnerabilities catalog or were reported by vendors. The vulnerabilities affected a wide range of products from 61 vendors, with Microsoft products being the most frequently impacted.