The Mstoreapp Mobile App WordPress plugin through 2.08 and Mstoreapp Mobile Multivendor through 9.0.1 do not properly verify users identify when using an AJAX action, allowing unauthenticated users to retrieve a valid session for arbitrary users by knowing their email address.
https://wpscan.com/vulnerability/6432bd1a-6e44-4a3f-890b-df2bd877d626/