Vulnerability Details CVE-2026-16103
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 27.7%
CVSS Severity
CVSS v3 Score 4.3
References
Products affected by CVE-2026-16103
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cpe:2.3:a:redhat:build_of_keycloak:-