{"schemaVersion":3,"id":"CVE-2026-42207","aliases":[],"status":"published","duplicateOf":null,"title":"Magento LTS: Open Redirect via Unvalidated `uenc` Parameter in `stockAction()` - magento-lts","description":"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. 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