Input validation vulnerability in RSVPMaker 10.6.6

The RSVPMaker plugin for WordPress is a software program that makes it easier to create and manage events. In versions up to and including 10.6.6, there is a security vulnerability that allows unauthenticated attackers to inject malicious code into the system. This code could be used to delete files, access sensitive data, or run additional code. There is no additional security measure installed on the system to make this more difficult.