CVE-2026-9099

Estado: AnalizadaAlta (7.7)—

A flaw was found in Keycloak. A missing authorization check in the GroupResource.addChild() endpoint within the Admin REST API allows an authenticated user with limited administrative privileges to reparent any existing group. When Fine-Grained Admin Permissions v2 (FGAPv2) is enabled, an attacker with management rights over a single low-privilege group can reparent a highly privileged group (such as one possessing the realm-admin role) under their managed group.

Because group permissions follow a hierarchical structure, this action unauthorizedly grants the attacker management and password-reset capabilities over the members of the targeted privileged group.

Leer descripción completaMostrar menos

An attacker can exploit this to reset an administrator's password, compromise the account, and achieve a full realm takeover, leading to a complete compromise of confidentiality, integrity, and availability.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N
Puntuación base: 7.7

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.49%
Percentil entre todas las CVEs puntuadas: 40
Fecha de la puntuación: 4/10/2026

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 principalT1098.002 Additional Email Delegate Permissionspersistence · privilege escalation90 %
Impacto secundarioT1078.002 Domain Accountsstealth · persistence · privilege escalation · initial access85 %
Impacto secundarioT1565.001 Stored Data Manipulationimpact75 %

Autenticado con PR:H explota endpoint REST remoto de Keycloak para reparentar grupos y escalar a realm-admin. Logra resetear credenciales de administrador, comprometiendo cuentas privilegiadas y asumiendo control total del sistema.

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 Multi-factor Authentication Disable or Remove Feature or Program Vulnerability Scanning User Training User Account Management

Tecnologías afectadas (1)

Redhat — Build OF Keycloak

CWE

CWE-639
CWE-639

Referencias

JSON original (NVD)

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