CVE-2026-18571 — MEDIUM (6.6)

Vulnerability Description

A flaw was found in the user creation component of Keycloak when Fine-Grained Admin Permissions V2 (FGAP V2) is enabled. This issue allows a sub-administrator with permission to create users to add those users to any group, even groups the sub-administrator is not authorized to manage. This could lead to unauthorized access to sensitive information or elevated privileges for the newly created users.

CVSS Score

6.6

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Redhat	Build Of Keycloak	-

Related Weaknesses (CWE)

CWE-862

References

https://access.redhat.com/security/cve/CVE-2026-18571Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2509759Issue TrackingVendor Advisory

FAQ

What is CVE-2026-18571?

CVE-2026-18571 is a vulnerability with a CVSS score of 6.6 (MEDIUM). A flaw was found in the user creation component of Keycloak when Fine-Grained Admin Permissions V2 (FGAP V2) is enabled. This issue allows a sub-administrator with permission to create users to add th...

How severe is CVE-2026-18571?

CVE-2026-18571 has been rated MEDIUM with a CVSS base score of 6.6/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-18571?

Check the references section above for vendor advisories and patch information. Affected products include: Redhat Build Of Keycloak.