Descripción
A flaw was found in Keycloak. An authenticated user with low privileges can exploit this vulnerability by sending an oversized subject_token JSON Web Token (JWT) to the TokenEndpoint. When the token exceeds a 4000-character limit, it is silently dropped, causing the system to fall back to client credentials. This allows the user to gain the permissions of the client-s service account, leading to privilege escalation.
CVSS 6.8EPSS 0.32%Riesgo 0.7
Ver fuente- Publicación
- 2026-05-27 14:17:40
- Versiones afectadas
- unknown
- Tipo
- Core software
- Vector
- CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N