---
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: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:N'
cwe:
  - CWE-284
vendor: joomla
product: joomla!
affected:
  - 'joomla! >= 4.0.0, < 5.4.8'
  - 'joomla! >= 6.0.0, < 6.1.3'
patched:
  - joomla! 6.1.3
published: '2026-09-29'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T16:33:08.870'
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
epss: 0.00214
epssPercentile: 0.11663
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-30T15:11:46.721826Z'
scores:
  nvd: 5.5
  cna: 7
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.

## Affected

- `joomla! >= 4.0.0, < 5.4.8`
- `joomla! >= 6.0.0, < 6.1.3`

## Remediation

Upgrade past the affected range:

- `joomla! 6.1.3`