Vulnerability · Published May 15, 2026 · Assigned by GitHub_M

CVE-2026-42207Magento LTS: Open Redirect via Unvalidated `uenc` Parameter in `stockAction()` - magento-lts

Medium 6.1

In plain English

A medium-severity open redirect in magento-lts from OpenMage. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.1Medium

Exploit odds (30 days)0.2%top 92.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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. This vulnerability is fixed in 20.18.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	openmage/magento-lts	20.18.0	GHSA-qpgq-5g92-j5q8

Affected products (as reported)

Vendor	Product	Versions
OpenMage	magento-lts	< 20.18.0

Weakness: CWE-601 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References

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