CVE-2026-1609

Estado: AnalizadaAlta (8.1)—

A flaw was found in Keycloak. When the JSON Web Token (JWT) authorization grant preview feature is enabled and a user account is disabled, Keycloak fails to validate the user’s disabled status during JWT authorization grant processing. A remote attacker with low privileges can exploit this improper access control vulnerability by presenting a valid assertion token from an external identity provider to obtain a JWT for a disabled user. This allows unauthorized access to sensitive resources.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Puntuación base: 8.1

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.56%
Percentil entre todas las CVEs puntuadas: 45
Fecha de la puntuación: 5/10/2026

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.

ExplotaciónT1210 Exploitation of Remote Serviceslateral movement85 %
Impacto principalT1078.002 Domain Accountsstealth · persistence · privilege escalation · initial access80 %
Impacto secundarioT1556.002 Password Filter DLLdefense impairment · persistence · credential access70 %

Vulnerabilidad en servicio remoto (Keycloak) que requiere privilegios bajos (PR:L). Impacto: obtención de JWT para usuario deshabilitado (T1078.002) y manipulación de autorización OAuth/OIDC (T1556.002).

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

Privileged Account Management Vulnerability Scanning User Training User Account Management Threat Intelligence Program Password Policies

Tecnologías afectadas (1)

Redhat — Build OF Keycloak

CWE

CWE-284
CWE-284

Referencias

JSON original (NVD)

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