GHSA-f2hx-5fx3-hmcv
Keycloak: UMA Policy Resource Injection Allows Unauthorized Cross-User Permission Grants
Quick fix
GHSA-f2hx-5fx3-hmcv — org.keycloak:keycloak-services: upgrade to the fixed version with the command below.
# pom.xml: bump <version>26.5.7</version> for org.keycloak:keycloak-servicesDetails
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.
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Affected packages
0Fixed in: 26.5.7# pom.xml: bump <version>26.5.7</version> for org.keycloak:keycloak-servicesReferences
- https://nvd.nist.gov/vuln/detail/CVE-2026-4636[ADVISORY]
- https://github.com/keycloak/keycloak/issues/47717[WEB]
- https://github.com/keycloak/keycloak/commit/995832f8b74b02833d106c8788bb7a78634aa725[WEB]
- https://access.redhat.com/errata/RHSA-2026:6475[WEB]
- https://access.redhat.com/errata/RHSA-2026:6476[WEB]
- https://access.redhat.com/errata/RHSA-2026:6477[WEB]
- https://access.redhat.com/errata/RHSA-2026:6478[WEB]
- https://access.redhat.com/security/cve/CVE-2026-4636[WEB]
- https://bugzilla.redhat.com/show_bug.cgi?id=2450251[WEB]
- https://github.com/keycloak/keycloak[PACKAGE]