What is CVE-2026-42207?

CVE-2026-42207 is a medium-severity vulnerability in Openmage Magento-Lts, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2026-05-15.

How severe is CVE-2026-42207?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Open Redirect in Openmage Magento-Lts

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.

Vulnerability class: Open Redirect

EPSS: 0.001 (4.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Openmage Magento-lts — versions < 20.18.0

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-42207?: CVE-2026-42207 is a medium-severity vulnerability in Openmage Magento-Lts, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2026-05-15.
How severe is CVE-2026-42207?: Medium severity. CVSS v3 base score is 6.1 out of 10.