The Motors WordPress plugin before 1.4.121 does not verify that a request is authorized to view a user's non-published listings before returning them, allowing unauthenticated attackers to read any author's draft, pending and private car listings - including titles, prices, media URLs and seller notes - by supplying only the target's numeric user id.
https://wpscan.com/vulnerability/790e62ae-297b-4fcd-9650-b3b99a417713/