Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

CVE-2026-97846

Gravedad CVSS v3.1:
MEDIA
Tipo:
CWE-287 Autenticación incorrecta
Fecha de publicación:
25/09/2026
Última modificación:
25/09/2026

Descripción

*** Pendiente de traducción *** Keycloak provides a feature called mTLS holder-of-key binding which ensures that a token can only be used by the client that originally requested it by binding it to their digital certificate. A flaw was discovered where the new Standard Token Exchange V2 feature does not check for this certificate. This allows an attacker with stolen client credentials to obtain a standard, unrestricted token that bypasses these security protections.