CVE-2026-1529

Estado: AplazadaAlta (8.1)—

A flaw was found in Keycloak. An attacker can exploit this vulnerability by modifying the organization ID and target email within a legitimate invitation token's JSON Web Token (JWT) payload. This lack of cryptographic signature verification allows the attacker to successfully self-register into an unauthorized organization, leading to unauthorized access.

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: 0.47%
Percentil entre todas las CVEs puntuadas: 39
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 movement75 %
Impacto principalT1078.004 Cloud Accountsstealth · persistence · privilege escalation · initial access85 %
Impacto secundarioT1556.004 Network Device Authenticationdefense impairment · persistence · credential access70 %

CVE-2026-1529: Requiere PR:L (privilegios de usuario autenticado) en red, permitiendo modificar JWT sin validación criptográfica para auto-registrarse en organizaciones no autorizadas, obteniendo cuenta válida (T1078.004) y acceso administrativo potencial en aplicación Keycloak.

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 Active Directory Configuration Vulnerability Scanning User Training User Account Management

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Keycloak — Keycloak^AI

CWE

CWE-347
CWE-347

Referencias

JSON original (NVD)

Mostrar

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      "lang": "es",
      "value": "Se encontró una falla en Keycloak. Un atacante puede explotar esta vulnerabilidad modificando el ID de la organización y el correo electrónico de destino dentro de la carga útil (payload) de un JSON Web Token (JWT) de un token de invitación legítimo. Esta falta de verificación de firma criptográfica permite al atacante registrarse exitosamente en una organización no autorizada, lo que lleva a un acceso no autorizado."
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