CVE-2026-40488
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 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.
How to fix
- openmage magento20.17.0 or later
- openmage/magento-lts20.17.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| openmage magento | v < 20.17.0 | 20.17.0 |
| openmage/magento-ltsPackagist | v < 20.17.0 | 20.17.0 |
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Attack Surface Management
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