CVE-2026-66917

HIGH CVSS 4.0: 8.6
Updated Aug 22, 2026
Joomla
Parameter Value
CVSS 8.6 (HIGH)
Type CWE-79 (Cross-Site Scripting (XSS))
Vendor Joomla
Public PoC No

Joomla Extension - joomgalleryfriends.net - Stored XSS in JoomGallery < 4.4.0 - An authenticated, privileged can store an XSS payload in any image causing JS execution in every visitor's browser.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
High
Admin privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v4.0

Vulnerable Products

joomgalleryfriends.net:joomgallery extension for joomla