The JS Help Desk WordPress plugin before 3.1.4 does not perform any authorization, nonce, or ownership check on a front-end request dispatcher, allowing unauthenticated users to upload files (limited to the JS Help Desk WordPress plugin before 3.1.4's inert allowed extensions) and attach them to arbitrary users' support tickets.
The JS Help Desk WordPress plugin before 3.1.5 does not verify that the requesting user owns the ticket being loaded: a low-privileged authenticated user can supply another user's ticket ID and read that ticket's contents, including the reporter's PII and message body.