iGMS Direct Booking < 2.0 - Unauthenticated Stored XSS via Widget Settings

The iGMS Direct Booking WordPress plugin before 2.0 does not authorise or escape its widget appearance settings, allowing unauthenticated users to store arbitrary web scripts that execute in the context of an administrator viewing the iGMS Direct Booking WordPress plugin before 2.0 settings, and in the browser of any visitor to a page displaying the booking widget.