Client Policy Flaw in Keycloak Affects Security Controls
CVE-2026-18207

6.5MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Build Of Keycloak
Red Hat Data Grid 8
Red Hat Jboss Enterprise Application Platform Expansion Pack
Red Hat Single Sign-on 7
Vendor
CVE Published:
29 July 2026

What is CVE-2026-18207?

A security issue exists in the client policy enforcement of Keycloak, where group membership is erroneously checked by name rather than by a unique identifier. This vulnerability permits attackers with client management privileges to circumvent established security policies by simply joining a group that has a name match in a different group hierarchy. Consequently, this misconfiguration enables unauthorized actions such as registering or updating clients without adhering to the necessary security hardening profiles.

References

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

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Paul Bottinelli (Trail of Bits) for reporting this issue.
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