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

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

7.8 HIGHEPSS 0.34%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Overview

Severity

ScoreSeverityVersionVector String
7.8HIGH3.1microsoft (CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8HIGH3.1microsoft (CNA)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

CISA required action

⚡ Known exploited · remediation due Jul 28, 2026

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.

Details

CVE ID
CVE-2026-56155
Status
Analyzed
Assigner (CNA)
microsoft
Published
Jul 14, 2026
Last modified
2026-11-01 17:32 UTC
Weaknesses
  • CWE-1220 · Insufficient Granularity of Access Control

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-07 16:47 UTC.