CVE-2026-16103 — Keycloak-services: keycloak-services: incomplete fix for ciba brute-force lockout bypass at token redemption
A flaw was found in the keycloak-services component of Keycloak. This issue is an incomplete fix for CVE-2026-9798, where brute-force protection checks were added to the Client-…
Published: 2026-07-17 · CVSS: 4.3 · CVSS 3.1
A flaw was found in the keycloak-services component of Keycloak. This issue is an incomplete fix for CVE-2026-9798, where brute-force protection checks were added to the Client-Initiated Backchannel Authentication (CIBA) initiation handler but were omitted from the token redemption handler. This allows an attacker with valid client credentials to obtain access and refresh tokens for a user account that has been locked due to brute-force protection, provided the authentication request was started before the lockout occurred and was approved by the user.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7