OpenMage magento-lts up to 20.17.x stockAction redirect

Summaryinfo

A vulnerability has been found in OpenMage magento-lts up to 20.17.x and classified as problematic. This vulnerability affects the function Mage_ProductAlert_AddController::stockAction. This manipulation causes redirect. This vulnerability appears as CVE-2026-42207. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic was found in OpenMage magento-lts up to 20.17.x. Affected by this vulnerability is the function Mage_ProductAlert_AddController::stockAction. The manipulation with an unknown input leads to a redirect vulnerability. The CWE definition for the vulnerability is CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. As an impact it is known to affect integrity. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-42207 since 04/25/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1204.001 for this issue.

Upgrading to version 20.18.0 eliminates this vulnerability.

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Productinfo

Type

• E-Commerce Management Software

Vendor

• OpenMage

Name

• magento-lts

Version

• 20.0
• 20.1
• 20.2
• 20.3
• 20.4
• 20.5
• 20.6
• 20.7
• 20.8
• 20.9
• 20.10
• 20.11
• 20.12
• 20.13
• 20.14
• 20.15
• 20.16
• 20.17

Website

• Product: https://github.com/OpenMage/magento-lts/

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