CVE-2026-56155
KEVMicrosoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability
View CVE record →- Vendor / Project
- Microsoft
- Product
- Active Directory Federation Services
- Date added
- Jul 14, 2026
- Due date
- Jul 28, 2026
- Known ransomware use
- Unknown
- CWEs
- CWE-1220
Description
Microsoft Active Directory Federation Services contains an insufficient granularity of access control vulnerability that allows an authorized attacker to elevate privileges locally.
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.
Notes
- https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-56155
- BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
- Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
- https://nvd.nist.gov/vuln/detail/CVE-2026-56155
- https://learn.microsoft.com/en-us/windows-server/identity/ad-fs/decommission/adfs-decommission-guide