When a Keycloak server is configured to support mTLS authentication for OAuth/OpenID clients, it does not properly verify the client certificate chain. A client that possesses a proper certificate can authorize itself as any other client and therefore access data that belongs to other clients.
{ "nvd_published_at": "2023-10-04T11:15:10Z", "cwe_ids": [ "CWE-295" ], "severity": "HIGH", "github_reviewed": true, "github_reviewed_at": "2023-06-30T20:31:37Z" }