Improper access control in Keycloak - CVE-2026-3009
Published: September 10, 2026
Vulnerability identifier: #VU148924
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-3009
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to authenticate through a disabled identity provider.
The vulnerability exists due to improper enforcement of disabled identity provider status in the IdentityBrokerService.performLogin endpoint when processing broker login requests. A remote user can submit a manually constructed request to the broker login endpoint to authenticate through a disabled identity provider.
Exploitation requires a valid session_code and tab_id obtained from a standard login attempt.
Affected software
Keycloak
Red Hat build of Keycloak
Red Hat build of Keycloak
How to mitigate CVE-2026-3009
Install security update from vendor's website.
Keycloak - update to 26.5.5
Red Hat build of Keycloak - update to 26.4.10
Red Hat build of Keycloak - update to 26.4.10