---
id: CVE-2026-18571
title: >-
  A flaw was found in the user creation component of Keycloak when Fine-Grained
  Admin Permissions V2 (FGAP V2) is enabled
summary: >-
  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 t…
severity: medium
cvss: 6.6
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-862
vendor: redhat
product: build_of_keycloak
affected:
  - build_of_keycloak
patched:
  - build_of_keycloak 26.6.7
published: '2026-08-02'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T19:17:09.640'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-18571'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:68277'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:68278'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-18571'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2509759'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-18571.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-18571'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-18571'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00548
epssPercentile: 0.43446
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-03T19:52:00.891860Z'
ingestedAt: '2026-08-02T13:18:29.745Z'
---

## Overview

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.

## Affected

- `build_of_keycloak`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **RHSA-2026:68278** · Red Hat · fixed in: Red Hat build of Keycloak 26.6.7 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68278)
- **RHSA-2026:68277** · Red Hat · fixed in: Red Hat build of Keycloak 26.6 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68277)