Orders Tracking for WooCommerce < 1.2.6 - Admin+ Arbitrary File Access/Read

The Orders Tracking for WooCommerce WordPress plugin before 1.2.6 doesn't validate the file_url parameter when importing a CSV file, allowing high privilege users with the manage_woocommerce capability to access any file on the web server via a Traversal attack. The content retrieved is however limited to the first line of the file.