Keycloak Access Control and Information Disclosure

Keycloak's User-Managed Access endpoint fails to properly enforce access control on PUT operations, permitting authenticated attackers to modify protected resources despite the allowRemoteResourceManagement restriction being disabled. This access control bypass affects data integrity and impacts any organization using Keycloak for identity and access management. The vulnerability requires valid credentials to exploit and currently has no available patch.

Keycloak contains an information disclosure vulnerability in the identity-first login flow when Organizations are enabled, where differential error messages allow remote attackers to enumerate valid user accounts without authentication. The vulnerability affects Red Hat Build of Keycloak across multiple versions, and while the CVSS score is low (3.7), the attack requires only network access with no user interaction. This user enumeration flaw could facilitate credential stuffing, phishing, or social engineering campaigns by confirming the existence of target accounts.