CVE-2026-117551
Received Received - Intake

Remote Code Execution in jDownloads Joomla Extension

Publication date: 2026-11-12

Last updated on: 2026-11-12

Assigner: Joomla! Project

Description
Joomla Extension - jdownloads.com - RCE through file upload in jDownloads < 4.1.8 - Insufficient validation of frontend thumbnail uploads allowed users with upload permission to place executable files on the server. This results in PHP code execution.

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Meta Information

Published
2026-11-12
Last Modified
2026-11-12
Generated
2026-11-12
AI Q&A
2026-11-12
EPSS Evaluated
N/A
NVD
CVE-2026-117551
EUVD
EUVD-2026-124608

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
joomla jdownloads to 4.1.8 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-434 The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.

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Executive Summary

This vulnerability is a Remote Code Execution (RCE) flaw in the jDownloads Joomla extension versions before 4.1.8. It occurs due to insufficient validation of file uploads, allowing users with upload permissions to upload executable files like PHP scripts. These files can then be executed on the server, leading to full system compromise.

Detection Guidance

Check for unauthorized PHP files in upload directories, especially in jDownloads components. Review server logs for suspicious file uploads or execution attempts. Verify file extensions and MIME types in upload handlers.

Impact Analysis

An attacker could exploit this to execute arbitrary code on your server, potentially taking full control of your Joomla site and the underlying system. This could lead to data theft, defacement, or further attacks against your infrastructure.

Compliance Impact

This vulnerability could lead to unauthorized access and data breaches, violating GDPR (data protection) and HIPAA (health data privacy) requirements. Organizations may face fines, legal penalties, and reputational damage due to non-compliance.

Mitigation Strategies

Upgrade jDownloads to version 4.1.8 or later. Disable frontend upload permissions for untrusted users. Implement strict file upload validation to block executable PHP files. Monitor server for signs of compromise.

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