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8.6

Joomla JoomGallery <4.4.0 lets attackers run code in visitors' browsers

CVE-2026-66917 · published 2 months ago
Summary

A user who is logged in and has upload rights can place hidden script code inside an image in the JoomGallery extension. When any visitor views that image, the script runs in their browser, which could be used to steal information or take over the session. Update the extension to version 4.4.0 or later and limit image‑upload permissions to trusted users.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
joomgalleryfriends.net joomgallery extension for joomla 4.0.0-4.3.0
Original advisory text
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.
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.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
8.6 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-79Cross-site Scripting (XSS)
Timeline
Published22 Aug 2026
Updated4 Nov 2026
First seen22 Aug 2026
Sources
CVE-2026-66917 · NVD
CVE-2026-66917 · MITRE
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