CVE-2026-66490: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in balbooa.com Gridbox extension for Joomla
Joomla Extension - balbooa.com - Stored cross-site scripting via a comment avatar in Gridbox < 2.20.2
AI Analysis
Technical Summary
CVE-2026-66490 is a stored cross-site scripting vulnerability (CWE-79) in the balbooa.com Gridbox extension for Joomla. The issue occurs due to improper input sanitization of comment avatars, allowing malicious script injection. The affected versions are from 1.0.0 up to and including 2.20.1. No CVSS score or vendor advisory with patch information is currently available, and no known exploits in the wild have been reported.
Potential Impact
Successful exploitation could allow an attacker to execute arbitrary scripts in the browsers of users who view the affected comment avatars. This may lead to session hijacking, defacement, or other malicious actions within the context of the affected Joomla site. However, no known active exploitation has been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, consider restricting or sanitizing user input related to comment avatars as a temporary mitigation.
CVE-2026-66490: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in balbooa.com Gridbox extension for Joomla
Description
Joomla Extension - balbooa.com - Stored cross-site scripting via a comment avatar in Gridbox < 2.20.2
CVSS v3.1
Score 6.1medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-66490 is a stored cross-site scripting vulnerability (CWE-79) in the balbooa.com Gridbox extension for Joomla. The issue occurs due to improper input sanitization of comment avatars, allowing malicious script injection. The affected versions are from 1.0.0 up to and including 2.20.1. No CVSS score or vendor advisory with patch information is currently available, and no known exploits in the wild have been reported.
Potential Impact
Successful exploitation could allow an attacker to execute arbitrary scripts in the browsers of users who view the affected comment avatars. This may lead to session hijacking, defacement, or other malicious actions within the context of the affected Joomla site. However, no known active exploitation has been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, consider restricting or sanitizing user input related to comment avatars as a temporary mitigation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Joomla
- Date Reserved
- 2026-07-27T13:01:42.270Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a6a093c9c2644c7f89a314b
Added to database: 07/29/2026, 14:07:56 UTC
Last enriched: 07/29/2026, 14:25:06 UTC
Last updated: 07/29/2026, 21:24:53 UTC
Views: 6
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