---
id: CVE-2026-90913
title: >-
  Joomla! Core - [20260903] - Core - Improper ACL checks for access level
  webservice endpoints in Joomla 4.0.0-5.4.8, 6.0.0-6.1.3 - An improper access
  check allows unauthorized users to perform mutation actions in access level
  endpoints.
summary: >-
  Joomla! Core - [20260903] - Core - Improper ACL checks for access level
  webservice endpoints in Joomla 4.0.0-5.4.8, 6.0.0-6.1.3 - An improper access
  check allows unauthorized users to perform mutation actions in access level
  endpoints.
severity: high
cvss: 7
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N'
cwe:
  - CWE-284
vendor: Joomla! Project
product: Joomla! CMS
affected:
  - joomla_cms 4.0.0-5.4.8
  - joomla_cms 6.0.0-6.1.3
published: '2026-09-29'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T17:17:13.263'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90913'
references:
  - url: >-
      https://developer.joomla.org/security-centre/1083-20260903-core-improper-acl-checks-for-user-level-webservice-endpoints.html
    label: security@joomla.org
  - url: 'https://www.joomla.org/'
    label: security@joomla.org
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-09-29T17:41:02.208Z'
---

## Overview

Joomla! Core - [20260903] - Core - Improper ACL checks for access level webservice endpoints in Joomla 4.0.0-5.4.8, 6.0.0-6.1.3 - An improper access check allows unauthorized users to perform mutation actions in access level endpoints.

## Remediation

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