CVE-2026-78000: j2commerce.com j2store Extension For Joomla

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

Joomla Extension - j2commerce.com - Reflected XSS via `filter_tag`, `pricefrom` and `priceto` in J2Store 1.0.0-3.3.21, 4.0.0-4.0.21, 4.1.0-4.1.6 - Four task handlers accepted a base64-encoded URL from user input and redirected to it without validating the destination host, enabling phishing using the shop's trusted domain. No authentication required.

Affected products

• j2commerce.com j2store Extension For Joomla: version 1.0.0-3.3.21 only; version 4.0.0-4.0.21 only; version 4.1.0-4.1.6 only

Published 2026-09-03. Last modified 2026-09-03.