CVE-2026-66490
MediumCVSS 6.1Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
Joomla Extension - balbooa.com - contains a stored cross-site scripting vulnerability via a comment avatar in Gridbox before version 2.20.2.
Risk Assessment
An attacker can inject malicious scripts that execute in other users' browsers, potentially leading to session theft, redirects, or data theft.
Recommendation
Update the Gridbox extension to version 2.20.2 or later and apply proper input filtering for comment avatars.
Other vulnerabilities in Gridbox
See all- CVE-2026-65888Critical
The Joomla extension Gridbox before version 2.20.2 has an account takeover vulnerability. The socialLogin method allows an attacker to log in as any user on the target site.
- CVE-2026-65887Critical
Joomla Extension Gridbox below version 2.20.2 has a vulnerability allowing an unauthenticated attacker to reset any user's password (excluding super admins). This allows logging in and acting as those users.
- CVE-2026-65890Critical
Joomla Extension Gridbox below version 2.20.2 has multiple SQL injection vectors allowing an unauthenticated attacker to inject SQL queries.
- CVE-2026-65884Critical
Joomla Extension Gridbox below version 2.20.2 has a privilege escalation vulnerability. The registration method allows users to provide usergroup IDs, enabling an unauthenticated attacker to register an account with administrative permissions.
- CVE-2026-61425Critical
The Joomla extension Gridbox versions below 1.6.0 contains an authentication bypass vulnerability. An attacker can gain full administrative access without providing valid credentials.
- CVE-2026-102784High
The Joomla extension Gridbox (by balbooa.com) below version 2.20.4.0 contains a CSRF vulnerability in the language installation feature because the addLanguage action does not require POST and does not validate the session token.
- CVE-2026-102783Medium
Path Traversal vulnerability in Joomla extension Gridbox (before 2.20.4.0) in the showImage action allows reading files from sibling directories if image decoding fails, due to insufficient containment checks.
- CVE-2026-65947High
Joomla Extension Gridbox from balbooa.com versions < 2.20.2 has various CSRF vectors in the admin interface.
- CVE-2026-65886High
Joomla Extension Gridbox below version 2.20.2 has a vulnerability allowing an unauthenticated attacker to read arbitrary files via the photo viewer.
- CVE-2026-66489Medium
Joomla Extension Gridbox from balbooa.com versions < 2.20.2 has various unauthenticated file system disclosure vectors.
Original NVD description (English source)
Joomla Extension - balbooa.com - Stored cross-site scripting via a comment avatar in Gridbox < 2.20.2
Vulnerability data from NVD (NIST) · CISA KEV · EPSS