Open redirect in magento-lts - CVE-2026-42207
Published: May 5, 2026
Vulnerability identifier: #VU129645
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-42207
CWE-ID: CWE-601
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to redirect users to an arbitrary external URL.
The vulnerability exists due to url redirection to untrusted site in Mage_ProductAlert_AddController::stockAction() when handling the uenc query parameter for requests with a non-existent product_id. A remote attacker can send a specially crafted link to redirect users to an arbitrary external URL.
User interaction is required, and the redirect occurs only after the customer is authenticated and the supplied product_id does not match an existing catalog product.
Affected software
magento-lts
How to mitigate CVE-2026-42207
Install security update from vendor's website.
magento-lts - update to 20.18.0