En bref
- CVE-2026-9704 est une vulnérabilité ÉLEVÉE (CVSS 8.8) touchant org.keycloak:keycloak-server-spi-private, org.keycloak:keycloak-services.
- Probabilité d'exploitation dans les 30 prochains jours (EPSS) : 0.32%, plus élevée que 25.1% des vulnérabilités.
- Correctif : mettre à jour vers 26.6.3 ou plus récent.
Description
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.
NVD description
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.
Autres vulnérabilités de org.keycloak:keycloak-server-spi-private
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