Vulnerability in Dynamic Client Registration Feature of Keycloak
CVE-2026-92857

8.1HIGH

Key Information:

Vendor

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

What is CVE-2026-92857?

Keycloak’s Dynamic Client Registration feature presents a security concern due to a flaw in the validation of registration requests. This vulnerability allows attackers possessing certain tokens to register malicious applications. By manipulating their user profile data and associating it with sensitive fields such as the user ID (sub) or intended audience (aud), attackers can forge signed security tokens. This impersonation capability could enable unauthorized access to services that depend on these tokens for verifying user identity, putting sensitive information and system integrity at significant risk.

References

https://access.redhat.com/security/cve/CVE-2026-92857
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2535817
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
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 Eurico Nicacio (independent) for reporting this issue.
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