CVE-2026-90917
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 - [20260907] - Core - Improper ACL checks in outputs for tagged items in Joomla 4.0.0-5.4.8, 6.0.0-6.1.3 - An improper access check allows unauthorized users to view content items from inaccessible categories.

CVSS Scores

EPSS Scores

Probability:
Percentile:

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-2026-90917
EUVD
EUVD-2026-89076

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
joomla core From 4.0.0 (inc) to 5.4.8 (exc)
joomla core From 6.0.0 (inc) to 6.1.3 (exc)

Helpful Resources

Exploitability

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

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability in Joomla! Core affects versions 4.0.0 to 5.4.8 and 6.0.0 to 6.1.3. It involves improper access control list (ACL) checks that allow unauthorized users to view content items from categories they should not have access to. Specifically, tagged items in these categories are exposed due to missing or incorrect permission checks.

Impact Analysis

If you are a Joomla! user running affected versions, unauthorized individuals may access sensitive or restricted content. This could lead to data leaks, privacy violations, or unauthorized exposure of confidential information. The impact depends on the nature of the exposed content and your site's configuration.

Compliance Impact

This vulnerability could violate compliance with GDPR, HIPAA, or other privacy regulations by exposing protected or sensitive data to unauthorized users. Organizations may face legal penalties, reputational damage, or loss of trust due to non-compliance resulting from this security flaw.

Mitigation Strategies

Update Joomla to the latest patched version (5.4.9 or later for Joomla 4.x, 6.1.4 or later for Joomla 6.x) to address the improper ACL checks in tagged items.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-90917. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart