The MStore API – Create Native Android & iOS Apps On The Cloud plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the profile picture upload functionality in all versions up to, and including, 4.16.4 due to insufficient file type validation. This makes it possible for authenticated attackers, with subscriber-level access and above, to upload HTML files with arbitrary web scripts that will execute whenever a user accesses the file.
The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.