Visitor management systems (VMS) simplify the process of admitting trusted outsiders into a campus. Unfortunately, anything you attach to a computer can be hacked, and VMS are no exception. We set out to find out how vulnerable the systems companies use to admit visitors are, and what we found was surprising--an industry with little focus on security. This talk will focus on the vulnerabilities found while analyzing several visitor management systems and demonstrate how to exploit those vulnerabilities and other misconfigurations to become a trusted visitor--without an appointment.