CVE-2026-4636 — Keycloak: keycloak: uma policy bypass allows authenticated users to gain unauthorized access to victim-owned resources.
A flaw was found in Keycloak. An authenticated user with the uma_protection role can bypass User-Managed Access (UMA) policy validation. This allows the attacker to include reso…
Published: 2026-04-02 · CVSS: 8.1 · CVSS 3.1
A flaw was found in Keycloak. An authenticated user with the uma_protection role can bypass User-Managed Access (UMA) policy validation. This allows the attacker to include resource identifiers owned by other users in a policy creation request, even if the URL path specifies an attacker-owned resource. Consequently, the attacker gains unauthorized permissions to victim-owned resources, enabling them to obtain a Requesting Party Token (RPT) and access sensitive information or perform unauthorized actions.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7