CVE-2026-66917 Joomla Extension - joomgalleryfriends.net - Stored XSS in JoomGallery < 4.4.0
An authenticated privileged user can store XSS payloads in images, leading to JavaScript execution in visitors' browsers.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-66917?
CVE-2026-66917 is a high-severity cross-site scripting vulnerability in joomgalleryfriends.net JoomGallery extension for Joomla, published on 22 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-66917?
How do I fix CVE-2026-66917?
No fix has been published for CVE-2026-66917 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-66917 being exploited?
There is no known exploitation of CVE-2026-66917 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-8vxv-gf52-gm5h.