CVE-2026-9798: Red Hat Build Of Keycloak

Medium severity, CVSS 4.3. EPSS: 0.5% chance of exploitation in the next 30 days.

A flaw was found in Keycloak, an open-source identity and access management solution. When a user account is temporarily locked due to repeated failed login attempts, an attacker with valid client credentials can exploit the Client-Initiated Backchannel Authentication (CIBA) flow to bypass this brute-force protection. This allows continued authentication attempts and token issuance even when the account should be locked, potentially enabling further unauthorized access attempts.

Affected products

• Red Hat Build Of Keycloak: affected versions not specified

Published 2026-05-28. Last modified 2026-08-20.