Input validation vulnerability in CP Contact Form with PayPal 1.3.52

The CP Contact Form with PayPal plugin for WordPress has a security vulnerability that affects all versions up to 1.3.52. This is because the function that checks for a security code is missing or not working properly. This means that someone who is not logged in can trick a website administrator into doing something, like clicking on a link, which will allow them to add discount codes without permission.