CVE-2026-9799: Red Hat Build Of Keycloak

Medium severity, CVSS 4.6. EPSS: 0.3% chance of exploitation in the next 30 days.

A flaw was found in org.keycloak.authorization. An authenticated user with a granted User-Managed Access (UMA) permission ticket for one resource can exploit this by using a specific permission request prefix to bypass per-resource access control. This allows the user to gain unauthorized access to all resources of that type within the same resource server, even if they do not have a ticket for those specific resources. This vulnerability requires the resource server to be configured in PERMISSIVE policy enforcement mode and affects typed resources with ownerManagedAccess enabled, where no explicit policy protects the resource type. The primary consequence is unauthorized information disclosure or modification of resources.

Affected products

• Red Hat Build Of Keycloak: from 26.4, before 26.4.13 (fixed in 26.4.13); from 26.6, before 26.6.4 (fixed in 26.6.4)

Published 2026-06-25. Last modified 2026-07-01.