Vulnerability · Published Aug 22, 2026 · Assigned by Joomla
CVE-2026-66917Joomla Extension - joomgalleryfriends.net - Stored XSS in JoomGallery < 4.4.0
High 8.6
In plain English
A high-severity cross-site scripting in JoomGallery extension for Joomla from joomgalleryfriends.net. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Severity (CVSS 4.0)8.6High
Exploit odds (30 days)0.5%top 55.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| joomgalleryfriends.net | JoomGallery extension for Joomla | 4.0.0-4.3.0 |
Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N