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EUVD-2026-292133

fkie_cve-2026-40488

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.

GHSA-3j5q-7q7h-2hhv — OpenMage LTS: Customer File Upload Extension Blocklist Bypass → Remote Code Execution

Affected: Packagist: openmage/magento-lts

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.

## Affected Version

- **Project:** OpenMage/magento-lts - **Vulnerable File:** `https://github.com/OpenMage/magento-lts/blob/main/app/code/core/Mage/Catalog/Model/Product/Option/Type/File.php` - **Vulnerable Lines:** 230-237 (`_validateUploadedFile()`) - **Configuration:** `app/code/core/Mage/Catalog/etc/config.xml:824`

## Root Cause

The file upload handler uses `Zend_File_Transfer_Adapter_Http` directly with `ExcludeExtension` validator, referencing only:

```xml  <forbidden_extensions>php,exe</forbidden_extensions> ```

This misses the comprehensive `protected_extensions` blocklist defined elsewhere:

```xml  php, php3, php4, php5, php7, htaccess, jsp, pl, py, asp, sh, cgi, htm, html, pht, phtml, shtml ```

## Vulnerable Code

```php // app/code/core/Mage/Catalog/Model/Product/Option/Type/File.php:230-237 $_allowed = $this->_parseExtensionsStri…