CVE-2026-55001

Estado: AnalizadaAlta (7.8)—

Improper certificate validation in Windows Active Directory allows an authorized attacker to elevate privileges locally.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.30%
Percentil entre todas las CVEs puntuadas: 21
Fecha de la puntuación: 6/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation95 %
Impacto secundarioT1078 Valid Accountsstealth · persistence · privilege escalation · initial access80 %

AV:L sin UI requiere escalada local (T1068). La validación impropia de certificados en AD permite suplantación (T1557) y obtención de credenciales (T1078) con privilegios elevados.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Application Developer Guidance Active Directory Configuration User Training User Account Management Threat Intelligence Program Privileged Account Management

Tecnologías afectadas (6)

Microsoft — Windows 10 1607 Microsoft — Windows 10 1809 Microsoft — Windows Server 2016 Microsoft — Windows Server 2019 Microsoft — Windows Server 2022 Microsoft — Windows Server 2025

CWE

CWE-295

Referencias

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55001

JSON original (NVD)

Mostrar

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