Input validation vulnerability in FastBook – Responsive Appointment Booking and Scheduling System 1.1

The FastBook plugin for WordPress, which helps schedule appointments and bookings, has a security vulnerability. This issue, called Cross-Site Request Forgery, affects all versions up to 1.1. It happens because the plugin doesn’t properly check the security code when a certain function is used. This allows hackers to change settings and insert harmful code onto a website if they can get a site administrator to click on a fraudulent link.