Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Red Hat / Red Hat build of Keycloak 26.4 | unaffected 26.4.14-1 before * |
| Red Hat / Red Hat build of Keycloak 26.4 | unaffected 26.4-22 before * |
| Red Hat / Red Hat build of Keycloak 26.4 | unaffected 26.4-22 before * |
| Red Hat / Red Hat build of Keycloak 26.4.14 | unaffected |
| Red Hat / Red Hat build of Keycloak 26.6 | unaffected 26.6.5-1 before * |
| Red Hat / Red Hat build of Keycloak 26.6 | unaffected 26.6-11 before * |
| Red Hat / Red Hat build of Keycloak 26.6 | unaffected 26.6-11 before * |
| Red Hat / Red Hat build of Keycloak 26.6.5 | unaffected |
CWE
CWE-305
References
- 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
- https://bugzilla.redhat.com/show_bug.cgi?id=2482470
ADP enrichment
No English description supplied.
No references supplied.