CVE-2026-4636
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.
Package Versions Affected
Automatically patch vulnerabilities without upgrading
CVSS Version
Related Resources
References
https://nvd.nist.gov/vuln/detail/CVE-2026-4636, https://github.com/keycloak/keycloak/issues/47717, https://github.com/keycloak/keycloak/commit/995832f8b74b02833d106c8788bb7a78634aa725, https://access.redhat.com/errata/RHSA-2026:6475, https://access.redhat.com/errata/RHSA-2026:6476, https://access.redhat.com/errata/RHSA-2026:6477, https://access.redhat.com/errata/RHSA-2026:6478, https://access.redhat.com/security/cve/CVE-2026-4636, https://bugzilla.redhat.com/show_bug.cgi?id=2450251, https://github.com/keycloak/keycloak
Basic Information
