Privilege escalation via unchecked group assignment
Published Aug 2, 2026 · Updated Aug 2, 2026
Missing authorization in the user creation API of Red Hat build of Keycloak allows remote authenticated users to assign unauthorized groups. The POST /admin/realms/{realm}/users endpoint accepts group memberships in the creation payload without checking manage-membership permission for each group. Exploitation requires non-default FGAP V2 and a high-privilege sub-administrator; newly created accounts can gain restricted data access or elevated privileges.
Summary
What happened
Missing authorization in the user creation API of Red Hat build of Keycloak allows remote authenticated users to assign unauthorized groups. The POST /admin/realms/{realm}/users endpoint accepts group memberships in the creation payload without checking manage-membership permission for each group. Exploitation requires non-default FGAP V2 and a high-privilege sub-administrator; newly created accounts can gain restricted data access or elevated privileges.
The record
- CVE
- CVE-2026-18571
- Published
- Aug 2, 2026
- Updated
- Aug 2, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat build of Keycloak
- Classifications
- CWE-862, T1098
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Aug 2, 2026CVE publishedPublication date reported by the CVE source.
- Aug 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
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Technologies
Your stack
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Your stack
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