CVE-2026-18571: Red Hat Build Of Keycloak

High severity, CVSS 7.2. EPSS: 0.5% chance of exploitation in the next 30 days.

A flaw was found in the user creation component of Keycloak when Fine-Grained Admin Permissions V2 (FGAP V2) is enabled. This issue allows a sub-administrator with permission to create users to add those users to any group, even groups the sub-administrator is not authorized to manage. This could lead to unauthorized access to sensitive information or elevated privileges for the newly created users.

Affected products

• Red Hat Build Of Keycloak: affected versions not specified

Published 2026-08-02. Last modified 2026-09-16.