CVE-2026-9798 – Keycloak: keycloak: brute-force protection bypass in ciba flow

CVE ID :CVE-2026-9798

Published : May 28, 2026, 6:16 a.m. | 15 minutes ago

Description :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.

Severity: 4.3 | MEDIUM

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