CVE-2026-90915
Received Received - Intake

Arbitrary Directory Deletion in Joomla Core via Cache Purge

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: Joomla! Project

Description
Joomla! Core - [20260905] - Core - Arbitrary directory deletion via cache purge action in Joomla 4.0.0-5.4.8, 6.0.0-6.1.3 -An improper validation of the cache group name allowed path traverals in the file storage of the caching layer, resulting in arbitrary directory deletions.

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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-2026-90915
EUVD
EUVD-2026-89088

Affected Vendors & Products

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

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-22 The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Attack-Flow Graph

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Executive Summary

CVE-2026-90915 is a vulnerability in Joomla! CMS where improper validation of cache group names allows path traversal attacks. This flaw enables attackers to delete arbitrary directories on the server through the cache purge action.

Detection Guidance

Check Joomla version using the Joomla admin panel or run: grep -r 'Joomla' /var/www/html/ or check version.php for version number. If running 4.0.0-5.4.8 or 6.0.0-6.1.3, the system is vulnerable.

Impact Analysis

Attackers could exploit this to delete critical directories on your Joomla server, potentially causing data loss, system instability, or unauthorized access. Servers hosting Joomla versions 4.0.0-5.4.8 or 6.0.0-6.1.3 are at risk.

Compliance Impact

This vulnerability could lead to unauthorized data deletion or access, violating GDPR's integrity principle or HIPAA's integrity and availability requirements. Compliance may be compromised if sensitive data is lost or exposed due to the attack.

Mitigation Strategies

Upgrade Joomla to version 5.4.9 or 6.1.4 immediately. If upgrading is not possible, disable the cache purge action in Joomla configuration or restrict access to the administrator panel.

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