The Printcart Web to Print Product Designer for WooCommerce plugin for WordPress is vulnerable to Directory Traversal in all versions up to, and including, 2.8.5 via the 'mockups' parameter. This makes it possible for unauthenticated attackers to read the contents of arbitrary files on the server, which can contain sensitive information. A valid nonce is obtainable by unauthenticated users via the companion nbdcheckuseloggedin nopriv AJAX endpoint, which freely mints and returns a nbdesigner-get-data nonce to any visitor; additionally, if the NBDESIGNERENABLENONCE constant is disabled, even this nonce gate is bypassed entirely.

The Printcart Web to Print Product Designer for WooCommerce WordPress plugin before 2.5.3 does not restrict a user-supplied URL before fetching it server-side and does not enforce a valid authorization check, allowing unauthenticated attackers to read arbitrary local files (including configuration files containing database credentials and secret keys) and to make server-side requests to internal resources.