Bypass in Client Policies of Keycloak by Red Hat
CVE-2026-16093

5.4MEDIUM

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:
17 July 2026

What is CVE-2026-16093?

A vulnerability exists in Keycloak's Client Policies feature, enabling an attacker with valid client credentials to bypass the requirement for signed JWTs. This flaw allows attackers to authenticate with unsigned assertion headers, effectively misleading the system into accepting the assertions as valid. Consequently, this could result in the use of less secure authentication methods, despite security policies enforced by system administrators.

References

https://access.redhat.com/security/cve/CVE-2026-16093
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2501729
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
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.
.