The RSVP and Event Management Plugin WordPress plugin before 2.7.8 does not have any authorisation checks when exporting its entries, and has the export function hooked to the init action. As a result, unauthenticated attackers could call it and retrieve PII such as first name, last name and email address of user registered for events
CWE-862 - Missing Authorization
The missing authorization vulnerability occurs when a software program allows users to access privileged parts of the program without verifying the user credentials. Impact of such a vulnerability depends on the resources employed by the software, ranging from account takeover to sensitive information exposure, denial of service, and complete system takeover.