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.
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Microsoft Active Directory Federation Services (AD FS) presenta una vulnerabilidad de control de acceso que permite a un atacante con acceso local elevar sus privilegios en el sistema. Esta falla está siendo explotada activamente y compromete la seguridad de los servicios de identidad en arquitecturas empresariales. Si administras infraestructura basada en Windows, es fundamental aplicar las actualizaciones de seguridad de inmediato.
Relevant roles
Severity
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCWE-1220CISA KEV
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.
EPSS
No EPSS score yet (CVE may be too fresh).
Affects
microsoft:windows_10_1607microsoft:windows_10_1809microsoft:windows_server_2012microsoft:windows_server_2016microsoft:windows_server_2019microsoft:windows_server_2022microsoft:windows_server_2025Technical description
Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.