CVE-2026-65885
Received Received - Intake

Authenticated File Upload in Gridbox Joomla Extension

Publication date: 2026-07-29

Last updated on: 2026-07-30

Assigner: Joomla! Project

Description
Joomla Extension - balbooa.com - Authenticated arbitrary file upload in Gridbox < 2.20.2 - File upload methods allows authenticated attackers to upload arbitrary files. Turns into an authenticated RCE if combined with CVE-2026-65884 as the required account can be created by the attacker.

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Meta Information

Published
2026-07-29
Last Modified
2026-07-30
Generated
2026-07-30
AI Q&A
2026-07-30
EPSS Evaluated
N/A
NVD
CVE-2026-65885

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
balbooa gridbox to 2.20.2 (exc)

Helpful Resources

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 an authenticated arbitrary file upload flaw in the Joomla extension Gridbox versions before 2.20.2. Attackers with valid credentials can upload malicious files to the server. If combined with another vulnerability (CVE-2026-65884), it can lead to remote code execution (RCE) due to the ability to create required accounts.

Detection Guidance

To detect this vulnerability, check if your Joomla site is running Gridbox versions before 2.20.2. Inspect file upload functionality for unauthorized file types or unexpected file paths. Review server logs for suspicious upload activities or unusual file extensions.

Impact Analysis

An attacker could exploit this to upload malicious files, potentially gaining control over the server. This could lead to data theft, system damage, or further network compromise. The impact depends on the attacker's goals and the server's role in the infrastructure.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR and HIPAA requirements for data protection. Organizations may face legal penalties, reputational damage, and loss of compliance certifications if exploited.

Mitigation Strategies

Immediately update Gridbox to version 2.20.2 or later. Remove any unauthorized files uploaded via this vulnerability. Restrict file upload permissions to trusted users only. Consider disabling file upload features if not essential.

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