{"id":"CVE-2026-4636","aliases":["GHSA-f2hx-5fx3-hmcv"],"url":"https://o3.security/vulnerability/CVE-2026-4636","summary":"Keycloak: keycloak: uma policy bypass allows authenticated users to gain unauthorized access to victim-owned resources.","details":"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.","published":"2026-08-25T11:42:31.728Z","modified":"2026-09-08T08:48:07.071696648Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Bitnami","name":"keycloak","fixedVersion":"26.2.1"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:6475"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:6476"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:6477"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:6478"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-4636"},{"type":"ADVISORY","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2450251"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4636"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4636.json"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-08T08:48:07.071696648Z"}}