CVE-2026-40488 — OpenMage LTS has Customer File Upload Extension Blocklist Bypass that Leads to Remote Code Execution

Description (CNA)

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 version 20.17.0, the product custom option file upload in OpenMage LTS uses an incomplete blocklist (`forbidden_extensions = php,exe`) to prevent dangerous file uploads. This blocklist can be trivially bypassed by using alternative PHP-executable extensions such as `.phtml`, `.phar`, `.php3`, `.php4`, `.php5`, `.php7`, and `.pht`. Files are stored in the publicly accessible `media/custom_options/quote/` directory, which lacks server-side execution restrictions for some configurations, enabling Remote Code Execution if this directory is not explicitly denied script execution. Version 20.17.0 patches the issue.

Affected (CNA)

Vendor / product	Versions
OpenMage / magento-lts	affected < 20.17.0

CWE

CWE-434

References

https://github.com/OpenMage/magento-lts/security/advisories/GHSA-3j5q-7q7h-2hhv

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.