---
id: CVE-2026-16106
title: >-
  A flaw was found in the admin REST API of Keycloak, a solution for identity
  and access management
summary: >-
  A flaw was found in the admin REST API of Keycloak, a solution for identity
  and access management. The issue occurs when a delegated administrator
  attempts to remove a child role from a composite role. Due to missing
  authorization checks…
severity: medium
cvss: 4.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-1220
  - CWE-862
vendor: redhat
product: build_of_keycloak
affected:
  - build_of_keycloak
patched:
  - build_of_keycloak 26.6.7
published: '2026-07-17'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T19:17:07.803'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-16106'
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-2026-16106'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2501739'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-16106.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-16106'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-16106'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00423
epssPercentile: 0.34022
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-07-17T16:51:57.921536Z'
ingestedAt: '2026-08-31T11:07:14.041Z'
---

## Overview

A flaw was found in the admin REST API of Keycloak, a solution for identity and access management. The issue occurs when a delegated administrator attempts to remove a child role from a composite role. Due to missing authorization checks, an attacker with limited administrative permissions can remove privileged roles they are not authorized to manage, leading to a loss of access for other users and administrators.

## 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)