CVE-2026-65885: CWE-434: Unrestricted Upload of File with Dangerous Type in balbooa.com Gridbox extension for Joomla
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.
AI Analysis
Technical Summary
CVE-2026-65885 is a vulnerability in the Gridbox extension for Joomla (versions up to 2.20.1) that allows authenticated users to upload arbitrary files due to insufficient restrictions on file types. This vulnerability is identified as CWE-434 (Unrestricted Upload of File with Dangerous Type). While the file upload alone requires authentication, it can escalate to remote code execution if combined with CVE-2026-65884, which allows an attacker to create the required account. The vulnerability has a high severity rating (CVSS 9.4) and affects versions from 1.0.0 through 2.20.1 inclusive.
Potential Impact
Authenticated attackers can upload arbitrary files to the affected Joomla extension, potentially leading to remote code execution when combined with another vulnerability (CVE-2026-65884). This can result in full compromise of the affected system. The vulnerability requires an authenticated user but has a critical impact due to the possibility of code execution.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch information is provided in the available data. Until a patch is available, restrict access to the Gridbox extension to trusted users only and monitor for suspicious activity related to file uploads. Follow vendor advisories closely for updates.
CVE-2026-65885: CWE-434: Unrestricted Upload of File with Dangerous Type in balbooa.com Gridbox extension for Joomla
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.
CVSS v4.0
Score 9.4critical
Affected software
balbooa.com
Gridbox extension for Joomla
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-65885 is a vulnerability in the Gridbox extension for Joomla (versions up to 2.20.1) that allows authenticated users to upload arbitrary files due to insufficient restrictions on file types. This vulnerability is identified as CWE-434 (Unrestricted Upload of File with Dangerous Type). While the file upload alone requires authentication, it can escalate to remote code execution if combined with CVE-2026-65884, which allows an attacker to create the required account. The vulnerability has a high severity rating (CVSS 9.4) and affects versions from 1.0.0 through 2.20.1 inclusive.
Potential Impact
Authenticated attackers can upload arbitrary files to the affected Joomla extension, potentially leading to remote code execution when combined with another vulnerability (CVE-2026-65884). This can result in full compromise of the affected system. The vulnerability requires an authenticated user but has a critical impact due to the possibility of code execution.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch information is provided in the available data. Until a patch is available, restrict access to the Gridbox extension to trusted users only and monitor for suspicious activity related to file uploads. Follow vendor advisories closely for updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Joomla
- Date Reserved
- 2026-07-23T09:17:01.409Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a69f4299c2644c7f88240b8
Added to database: 07/29/2026, 12:38:01 UTC
Last enriched: 08/13/2026, 13:46:01 UTC
Last updated: 09/11/2026, 07:31:54 UTC
Views: 92
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.