GitHub Advisoryadvisory · Maven

GHSA-q6h7-xxp7-7429 Keycloak has an Authentication Bypass by Primary Weakness

MEDIUM Published 2026-05-28 Modified 2026-08-05 Official page ↗
Aliases
CVE-2026-9798
Ecosystem
Maven
Packages
org.keycloak:keycloak-services
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Weaknesses
CWE-305
Reviewed
2026-07-01

Affected packages

• Maven org.keycloak:keycloak-services: <= 26.4.7 (no fix yet) • Maven org.keycloak:keycloak-services: >= 26.5.0, <= 26.6.4 (no fix yet)

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.

Related

Alias · CVE (1)

  • CVE-2026-9798 A flaw was found in Keycloak, an open-source identity and access management solution. vulnerability

Weakness · CWE (1)

  • CWE-305 Authentication Bypass by Primary Weakness weakness

References