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Actively exploited

Listed in CISA’s Known Exploited Vulnerabilities catalog since July 14, 2026.

CVE-2026-56155

Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability

Microsoft · Active Directory Federation Services

Added to KEV July 14, 2026

Alert details

Source feed
CISA KEV
CVE ID
CVE-2026-56155
CWE
CWE-1220
Affected products
Active Directory Federation Services · Microsoft Active Directory Federation Services · Microsoft

What happened

Microsoft Active Directory Federation Services contains an insufficient granularity of access control vulnerability that allows an authorized attacker to elevate privileges locally.

What it means for your business

Microsoft Active Directory Federation Services is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2026-56155). Microsoft Active Directory Federation Services contains an insufficient granularity of access control vulnerability that allows an authorized attacker to elevate privileges locally. CISA remediation due date: 2026-07-28. If you need help checking exposure, call (864) 335-9223.

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.

CISA due date: July 28, 2026

Sources

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