The Download Manager and Payment Form WordPress Plugin – WP SmartPay plugin for WordPress is vulnerable to Insecure Direct Object Reference in versions 1.1.0 to 2.7.13 via the show() function due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with Subscriber-level access and above, to view other user's data like email address, name, and notes.
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.