| Package | Affected versions | Patched versions |
|---|---|---|
| org.keycloak:keycloak-services | ≥ 26.3.0, < 26.4.9≥ 26.5.0, < 26.5.3< 26.2.13 | 26.4.926.5.326.2.13 |
A flaw was found in Keycloak. A significant Broken Access Control vulnerability exists in the UserManagedPermissionService (UMA Protection API). When updating or deleting a UMA policy associated with multiple resources, the authorization check only verifies the caller's ownership against the first resource in the policy's list. This allows a user (Owner A) who owns one resource (RA) to update a shared policy and modify authorization rules for other resources (e.g., RB) in that same policy, even if those other resources are owned by a different user (Owner B). This constitutes a horizontal privilege escalation.
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