Input validation vulnerability in Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin 1.6.6.20

The Appointment Booking Calendar plugin for WordPress, called Simply Schedule Appointments Booking Plugin, has a security issue that allows unauthorized users to reset the plugin’s settings. This happens because the plugin does not properly check for a security code when using a specific function. Attackers can take advantage of this by tricking a website administrator into clicking on a link and gaining access to the plugin’s settings.