CVE-2026-42207

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.

• CWE-601

• https://github.com/OpenMage/magento-lts/security/advisories/GHSA-qpgq-5g92-j5q8
• https://github.com/OpenMage/magento-lts/security/advisories/GHSA-qpgq-5g92-j5q8

Published

May 15, 2026

Last Modified

Jun 17, 2026

Status

Deferred

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