July 14, 2026 · Applied Cybernetics Group
CVE-2026-56155 — Microsoft Active Directory Federation Services
Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability
- Added to KEV
2026-07-14- Federal due date
2026-07-28- Vendor
- Microsoft
- Product
- Active Directory Federation Services
- EPSS
- 28.0th percentile (score 0.003, as of
2026-09-16) - NVD CVSS v3.1
- 7.8 (HIGH)
- Ransomware use
- Unknown
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2026-56155
CISA short 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.
NVD description
Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.