anonhaven

CVE-2026-66490

MEDIUM CVSS 3.1: 6.1 EPSS 0.15%
Updated Jul 30, 2026
Joomla
Parameter Value
CVSS 6.1 (MEDIUM)
Type CWE-79 (Cross-Site Scripting (XSS))
Vendor Joomla
Public PoC No

Joomla Extension - balbooa.com - Stored cross-site scripting via a comment avatar in Gridbox < 2.20.2

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
Required
User action required

Impact Assessment

Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
None
No disruption

CVSS Vector v3.1

Weakness Type (CWE)

CWE-79 Cross-Site Scripting (XSS)

References 2

https://mysites.guru/blog/gridbox-23-critical-vulnerabilities/
security@joomla.org
https://www.balbooa.com/gridbox
security@joomla.org
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