User Creation Flaw in Keycloak for Fine-Grained Admin Permissions V2
CVE-2026-18571

6.6MEDIUM

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:
2 August 2026

What is CVE-2026-18571?

A security vulnerability has been identified in Keycloak's user creation process when Fine-Grained Admin Permissions V2 is activated. This flaw permits a sub-administrator, who possesses the ability to create users, to assign those users to any group indiscriminately. This capability allows sub-administrators to place users into groups they are not authorized to manage, consequently posing a risk of unauthorized access to sensitive data or higher privilege levels for those unauthorized users.

References

https://access.redhat.com/security/cve/CVE-2026-18571
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2509759
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
6.6
Severity:
MEDIUM
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
High
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank robinho11842 for reporting this issue.
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