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GHSA-q6h7-xxp7-7429

Keycloak has an Authentication Bypass by Primary Weakness

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-9798

Packages

EcosystemPackageAffectedFixed in
Maven org.keycloak:keycloak-services <= 26.4.7 no fix listed
Maven org.keycloak:keycloak-services >= 26.5.0, <= 26.6.4 no fix listed

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.