VULNERABILITY INTELLIGENCE

CVE-2026-16103

CVSS score4.3 MEDIUM
EPSS probability0.34%
CISA KEVNot currently listed
Published2026-07-17
Last modified2026-08-31
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Description

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.

Weakness classification

  • secalert@redhat.com: CWE-305
  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-841

Primary references