Incorrect authorization in Keycloak - CVE-2026-2366

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Main Vulnerability Database Vulnerabilities #VU148933

Incorrect authorization in Keycloak - CVE-2026-2366

Published: September 10, 2026


Vulnerability identifier: #VU148933
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-2366
CWE-ID: CWE-863
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote user to disclose user organization membership information.

The vulnerability exists due to incorrect authorization in the organizations feature when handling organization membership queries. A remote user can use an unprivileged token to enumerate user organization memberships to disclose user organization membership information.


Affected software

Keycloak
Red Hat build of Keycloak

How to mitigate CVE-2026-2366

Install security update from vendor's website.

Keycloak - update to 26.5.6
Red Hat build of Keycloak - update to 26.4.11

External References

Related Security Bulletins