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Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability

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

MANARTECH SECURITY ALERT

Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability

CVE Numbers

CVE-2026-56155

Affected Product

Active Directory Federation Services — Microsoft

Threat Description

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

Severity Scale

CRITICALHIGHMEDIUMLOW

Severity

HIGH

Affected Versions

To be reviewed

Recommended Mitigation

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.

Reference Links