CVE-2026-74252: j2commerce.com j2store Extension For Joomla

High severity, CVSS 8.6. EPSS: 0.5% chance of exploitation in the next 30 days.

Joomla Extension - j2commerce.com - Stored XSS in Guest checkout in J2Store 1.0.0-3.3.20, 4.0.0-4.0.20, 4.1.0-4.1.5 - J2Commerce 4.1.5 is vulnerable to Stored Cross-Site Scripting (XSS) through the guest checkout billing address fields. An unauthenticated attacker exploits a filter bypass in Joomla's Input::getArray() combined with PHP's variables_order=EGPCS (Cookie overrides POST in $_REQUEST ) to store unsanitized HTML in fields such as billing_first_name.

Affected products

• j2commerce.com j2store Extension For Joomla: version 1.0.0-3.3.20 only; version 4.0.0-4.0.20 only; version 4.1.0-4.1.5 only

Published 2026-08-21. Last modified 2026-08-26.