CVE-2026-9099

Vendor solution

To mitigate this issue, restrict network access to the Keycloak Admin REST API to only trusted networks or localhost. This limits the attack surface by preventing unauthorized access to the API endpoints required for exploitation. Consult your network security documentation for specific firewall or network access control configurations. This may impact remote administration capabilities.

Red Hat statement

This vulnerability is rated as High impact. When Fine-Grained Admin Permissions (FGAPv2) are enabled in Keycloak, a delegated administrator with specific `manage-members` permissions on a low-privilege group can bypass authorization checks to reparent any other group, including those with `realm-admin` roles. This allows the attacker to reset passwords of members in the stolen group, leading to a full realm takeover.

Red Hat mitigation

To mitigate this issue, restrict network access to the Keycloak Admin REST API to only trusted networks or localhost. This limits the attack surface by preventing unauthorized access to the API endpoints required for exploitation. Consult your network security documentation for specific firewall or network access control configurations. This may impact remote administration capabilities.