CVE Watch15 jul 2026

CVE-2026-56155

Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability

CVSS

7.8

Alto

EPSS

0.3%

p27

KEV

SÍ

14 jul 2026

Exploit Today

0-100

Publicado: 14 jul 2026 · Última mod.: 15 jul 2026 · CWE-1220

EPSS · 30d

0.3%EPSS · 30 días2.3%

2026-08-022026-08-31

Ficha del catálogo KEV

Producto

Microsoft / Active Directory Federation Services

Vulnerabilidad

Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability

Añadido a KEV

14 jul 2026

Remediar antes de

28 jul 2026

Uso conocido en ransomware

Descripción resumida

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

Acción requerida

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.

Notas

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

Descripción técnica

Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.

Referencias oficiales

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