CVE-2026-71574: CWE-284 Improper Access Control in Joomla! Project Joomla! CMS
Joomla! Core - [20260803] - Inconsistent ACL checks for mutating webservice endpoints in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2 - An improper access check allows unauthorized users to perform mutation actions in webservice endpoints, where the same mutation was restricted in the backend UI.
AI Analysis
Technical Summary
This vulnerability in Joomla! CMS arises from inconsistent access control checks on mutating webservice endpoints in versions 4.0.0 to 5.4.6 and 6.0.0 to 6.1.2. Unauthorized users can exploit this flaw to perform mutation actions that should be restricted, due to improper enforcement of ACL policies compared to the backend UI. The CVSS 4.0 base score is 8.5, indicating a high severity issue with network attack vector, low attack complexity, and no user interaction required.
Potential Impact
Unauthorized users can perform mutation actions on Joomla! CMS webservice endpoints that should be restricted, potentially leading to unauthorized modifications of data or system state. This undermines the intended access control mechanisms and could compromise the integrity of the affected Joomla! installations.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary mitigation has been documented in the provided data. Users should monitor Joomla! Project advisories for updates and apply patches once available.
CVE-2026-71574: CWE-284 Improper Access Control in Joomla! Project Joomla! CMS
Description
Joomla! Core - [20260803] - Inconsistent ACL checks for mutating webservice endpoints in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2 - An improper access check allows unauthorized users to perform mutation actions in webservice endpoints, where the same mutation was restricted in the backend UI.
CVSS v4.0
Score 8.5high
Affected software
pkg:composer/joomla/joomla-cmsRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Joomla! CMS arises from inconsistent access control checks on mutating webservice endpoints in versions 4.0.0 to 5.4.6 and 6.0.0 to 6.1.2. Unauthorized users can exploit this flaw to perform mutation actions that should be restricted, due to improper enforcement of ACL policies compared to the backend UI. The CVSS 4.0 base score is 8.5, indicating a high severity issue with network attack vector, low attack complexity, and no user interaction required.
Potential Impact
Unauthorized users can perform mutation actions on Joomla! CMS webservice endpoints that should be restricted, potentially leading to unauthorized modifications of data or system state. This undermines the intended access control mechanisms and could compromise the integrity of the affected Joomla! installations.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary mitigation has been documented in the provided data. Users should monitor Joomla! Project advisories for updates and apply patches once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Joomla
- Date Reserved
- 2026-08-07T13:04:49.114Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a8482f1c6e8be03326f9aa9
Added to database: 08/18/2026, 16:06:09 UTC
Last enriched: 08/18/2026, 16:20:34 UTC
Last updated: 08/19/2026, 03:37:14 UTC
Views: 6
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