The YMC Filter WordPress plugin before 3.11.3 does not properly authorize access to one of its REST API endpoints and does not validate a user-supplied query parameter, allowing unauthenticated attackers to retrieve the titles and content of private, draft, and other non-public posts.
https://wpscan.com/vulnerability/b55ebf9e-a05d-4ae4-b653-da7db63e76d2/