CVE-2026-90916
Received Received - Intake

Improper ACL Check in Joomla Core

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: Joomla! Project

Description
Joomla! Core - [20260906] - Core - Improper ACL checks in content history comparison view in Joomla 4.0.0-5.4.8, 6.0.0-6.1.3 - An improper access check allows unauthorized users to view inaccessible contents.

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Meta Information

Published
2026-09-29
Last Modified
2026-09-29
Generated
2026-09-29
AI Q&A
2026-09-29
EPSS Evaluated
N/A
NVD
CVE-2026-90916
EUVD
EUVD-2026-89072

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
joomla core to 5.4.8 (exc)
joomla core to 6.1.3 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-284 The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Attack-Flow Graph

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Executive Summary

CVE-2026-90916 is a vulnerability in Joomla! CMS versions 4.0.0-5.4.8 and 6.0.0-6.1.3. It involves improper access control list checks in the content history comparison view, allowing unauthorized users to view contents they should not have access to.

Detection Guidance

Check Joomla version via system files or admin panel. Compare against affected versions 4.0.0-5.4.8 and 6.0.0-6.1.3. Review access logs for unauthorized content history view attempts.

Impact Analysis

This vulnerability allows unauthorized users to view restricted content, potentially exposing sensitive information. It could lead to data leaks or unauthorized access to private materials within a Joomla! site.

Mitigation Strategies

Upgrade Joomla to versions 5.4.9 or 6.1.4 immediately. Apply patches if available. Restrict access to content history features until updated.

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