Описание
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.
Ссылки
- MitigationVendor Advisory
- Issue TrackingVendor Advisory
Уязвимые конфигурации
EPSS
6.8 Medium
CVSS3
8.8 High
CVSS3
Дефекты
Связанные уязвимости
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.
A flaw was found in Keycloak. An authenticated user with low privilege ...
Keycloak Vulnerable to Improper Validation of Specified Quantity in Input
EPSS
6.8 Medium
CVSS3
8.8 High
CVSS3