CVE-2026-89298: Red Hat Build Of Keycloak

Medium severity, CVSS 4.9. EPSS: 0.4% chance of exploitation in the next 30 days.

A flaw was found in the Dynamic Client Registration service of Keycloak, an open-source identity and access management solution. The issue occurs when a user with the view-clients role accesses the client registration endpoint to retrieve client details. Due to a failure to mask sensitive information, the service returns the client's confidential secret in cleartext. This could allow a read-only administrator to obtain full access to the affected client's account and potentially escalate their privileges within the realm.

Affected products

• Red Hat Red Hat Build Of Keycloak
• Red Hat Red Hat Single Sign-On 7

Published 2026-09-11. Last modified 2026-09-16.