CVE-2026-9798 — Keycloak: keycloak: brute-force protection bypass in ciba flow
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 attacke…
Published: 2026-05-28 · CVSS: 4.3 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7