Access Control Flaw in Keycloak's User-Managed Access Feature
CVE-2026-4628

4.3MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Build Of Keycloak
Red Hat Jboss Enterprise Application Platform 8
Red Hat Jboss Enterprise Application Platform Expansion Pack
Red Hat Single Sign-on 7
Vendor
CVE Published:
23 March 2026

What is CVE-2026-4628?

An improper access control vulnerability exists in Keycloak's User-Managed Access (UMA) resource_set endpoint. This flaw allows attackers with valid credentials to bypass intended restrictions on remote resource management. Incomplete enforcement of access control checks during PUT operations to the resource_set endpoint enables unauthorized modifications to protected resources, compromising data integrity. It is crucial for system administrators to review access configurations and apply necessary updates to mitigate this risk.

References

https://access.redhat.com/security/cve/CVE-2026-4628
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2450240
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 Evan Hendra for reporting this issue.
.