CVE-2026-9798

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.

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Produits concernés

• Red Hat build of Keycloak 26.4
• Red Hat build of Keycloak 26.4.14
• Red Hat build of Keycloak 26.6
• Red Hat build of Keycloak 26.6.5
• Redhat build of keycloak

Scores CVSS

Faiblesses (CWE)

• CWE-305

Références

• https://access.redhat.com/errata/RHSA-2026:50846
• https://access.redhat.com/errata/RHSA-2026:50847
• https://access.redhat.com/errata/RHSA-2026:50848
• https://access.redhat.com/errata/RHSA-2026:50849
• https://access.redhat.com/security/cve/CVE-2026-9798 MitigationVendor Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2482470 Issue TrackingVendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories