OIDC Dynamic Client Registration Vulnerability in Keycloak
CVE-2026-107623

4.3MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Build Of Keycloak
Red Hat Single Sign-on 7
Vendor
CVE Published:
8 October 2026

What is CVE-2026-107623?

A flaw in Keycloak's OIDC Dynamic Client Registration component has been identified, where a bug in response serialization leads to the omission of the backchannel logout's offline token revocation setting. This results in the setting being silently disabled during standard updates, allowing offline tokens to remain valid even after user sessions are terminated via backchannel logout, thereby posing potential security risks.

References

https://access.redhat.com/security/cve/CVE-2026-107623
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2547957
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
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 Peter Su (psu512) for reporting this issue.
.