Keycloak Authentication and Authorization Bypass

Authenticated users with uma_protection role in Red Hat Keycloak can bypass User-Managed Access policy validation to gain unauthorized access to victim-owned resources. The vulnerability (confirmed actively exploited - CISA KEV) enables attackers to inject arbitrary resource identifiers during policy creation, obtaining Requesting Party Tokens for resources they do not own. With CVSS 8.1 (High), network-accessible attack vector, and low complexity, this represents a significant access control bypass in enterprise identity management deployments. EPSS data and public exploit status not confirmed from available data.

Denial of Service in Red Hat Build of Keycloak allows unauthenticated remote attackers to exhaust server resources by submitting specially crafted POST requests with excessively long scope parameters to the OpenID Connect token endpoint. No public exploit identified at time of analysis, but CVSS 7.5 (High) with network attack vector and low complexity indicates straightforward exploitation. Authentication requirements: unauthenticated (CVSS PR:N). The vulnerability stems from improper resource management (CWE-1050), enabling attackers to cause prolonged processing times and service disruption without any authentication or user interaction.

Authorization code forgery in Red Hat Keycloak enables unauthenticated attackers to escalate privileges to admin-level access tokens. The SingleUseObjectProvider's lack of type and namespace isolation permits attackers to forge valid authorization codes remotely, though exploitation requires high complexity (AC:H). No public exploit identified at time of analysis, with CVSS 7.4 indicating high confidentiality and integrity impact but no availability disruption.

Open redirect in Red Hat Build of Keycloak allows authenticated attackers with control over another path on the same web server to bypass wildcard-based redirect URI validation and steal OAuth access tokens. Attack requires low complexity and user interaction (CVSS 7.3). EPSS and KEV status not available; no public exploit identified at time of analysis. This CWE-601 flaw enables token theft through maliciously crafted redirect flows, posing significant risk to SSO deployments where Keycloak shares a web server with attacker-controllable content.

Keycloak's SingleUseObjectProvider lacks proper type and namespace isolation, allowing unauthenticated remote attackers with user interaction to delete arbitrary single-use entries and replay consumed action tokens such as password reset links, leading to account compromise. The vulnerability requires user interaction (UI:R) and high attack complexity (AC:H), resulting in a CVSS score of 5.3. No public exploit code or active exploitation has been confirmed at time of analysis.