CVE-2026-42207: Openmage Magento-LTS

Medium severity, CVSS 6.1. EPSS: 0.2% chance of exploitation in the next 30 days.

Magento Long Term Support (LTS) is an unofficial, community-driven project provides an alternative to the Magento Community Edition e-commerce platform with a high level of backward compatibility. Prior to 20.18.0, Mage_ProductAlert_AddController::stockAction() reads the uenc query parameter and passes it directly to $this->_redirectUrl($backUrl) without calling $this->_isUrlInternal(). When the supplied product_id does not match any catalog product, the server issues an unvalidated HTTP 302 redirect to whatever URL was provided as uenc. This vulnerability is fixed in 20.18.0.

Affected products

• Openmage Magento-LTS: before 20.18.0 (fixed in 20.18.0)

Published 2026-05-15. Last modified 2026-06-17.