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Tool Directory

CVE-2026-66917

HighPublished

Joomla Extension - joomgalleryfriends.net - Stored XSS in JoomGallery < 4.4.0

Published: Aug 22, 2026
Updated: Aug 24, 2026
Assigning CNA: Joomla
Evidence observed: Aug 24, 2026

Primary CVSS

8.6/ 10High

nvd · CVSS 4.0

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

0.5%

Low · next 30 days

Percentile: 39.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-66917PoC
IDOR + Stored XSS via Broken Object-Level Authorization in JoomGallery

Responsible use

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