It is possible to login as an administrator on the site due to logical mistakes in the code. The issue resides in wptc-cron-functions.php line 12 where it parses the request. This parse_request function calls the function decode_server_request_wptc which check if the raw POST payload contains a certain string. If it does, it calls wptc_login_as_admin and you'll be logged in as an administrator.
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Proof of Concept