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.
Ver en NVDAnálisis
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.
Roles relevantes
Severidad
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
Sin puntaje EPSS aún (CVE muy reciente).
Afecta
microsoft:windows_10_1607microsoft:windows_10_1809microsoft:windows_server_2012microsoft:windows_server_2016microsoft:windows_server_2019microsoft:windows_server_2022microsoft:windows_server_2025Descripción técnica
Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.