{"id":"BIT-keycloak-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.","aliases":["CVE-2026-4636","GHSA-f2hx-5fx3-hmcv"],"modified":"2026-09-08T08:48:07.071696648Z","published":"2026-08-25T11:42:31.728Z","database_specific":{"cpes":["cpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:text-only:*:*:*","cpe:2.3:a:keycloak:keycloak:*:*:*:*:*:*:*:*"],"severity":"High"},"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"}],"affected":[{"package":{"name":"keycloak","ecosystem":"Bitnami","purl":"pkg:bitnami/keycloak"},"ranges":[{"type":"SEMVER","events":[{"introduced":"26.2.0"},{"fixed":"26.2.1"},{"introduced":"26.2.15"},{"fixed":"26.3.0"},{"introduced":"26.4.0"},{"fixed":"26.4.1"},{"introduced":"26.4.11"},{"fixed":"26.5.0"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/keycloak/BIT-keycloak-2026-4636.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"}]}],"schema_version":"1.9.0"}