CVE-2026-18207 — MEDIUM (6.5)

Vulnerability Description

A flaw was found in the client policy enforcement mechanism of Keycloak. The issue occurs when the system checks group membership by name instead of a unique identifier. An attacker with client management privileges could bypass security policies by joining a group with a matching name in a different part of the group hierarchy, potentially allowing them to register or update clients without following required security hardening profiles.

CVSS Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

HIGH

Availability

NONE

Related Weaknesses (CWE)

CWE-285

References

https://access.redhat.com/security/cve/CVE-2026-18207

FAQ

What is CVE-2026-18207?

CVE-2026-18207 is a vulnerability with a CVSS score of 6.5 (MEDIUM). A flaw was found in the client policy enforcement mechanism of Keycloak. The issue occurs when the system checks group membership by name instead of a unique identifier. An attacker with client manage...

How severe is CVE-2026-18207?

CVE-2026-18207 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-18207?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.