GHSA-q6h7-xxp7-7429
Keycloak has an Authentication Bypass by Primary Weakness
At a glance
- Published
- Updated
- CVE
- CVE-2026-9798
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
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.
Affected packages
| Package | Versions |
|---|---|
| Maven · org.keycloak:keycloak-services | introduced 0, last affected 26.4.7 |
| Maven · org.keycloak:keycloak-services | introduced 26.5.0, last affected 26.6.4 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-9798 ADVISORY
- https://github.com/keycloak/keycloak/issues/49432 WEB
- https://github.com/keycloak/keycloak/pull/49791 WEB
- https://github.com/keycloak/keycloak/pull/49903 WEB
- https://github.com/keycloak/keycloak/pull/49905 WEB
- https://github.com/keycloak/keycloak/commit/11c2695064cd93da1d333df3f69d4a4141e86c29 WEB
- https://github.com/keycloak/keycloak/commit/2edc6b112e2dedce63062b89ab3c7ae542e0d9ac WEB
- https://github.com/keycloak/keycloak/commit/a11e3254efc16ae72ce5092b93b9f557a4ba43ae WEB
- https://access.redhat.com/errata/RHSA-2026:50846 WEB
- https://access.redhat.com/errata/RHSA-2026:50847 WEB
- https://access.redhat.com/errata/RHSA-2026:50848 WEB
- https://access.redhat.com/errata/RHSA-2026:50849 WEB
- https://access.redhat.com/security/cve/CVE-2026-9798 WEB
- https://bugzilla.redhat.com/show_bug.cgi?id=2482470 WEB
- https://github.com/keycloak/keycloak PACKAGE
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |