Muhammad Mujtaba a.k.a mushti is a Pakistani security researcher and bug bounty hunter who has been listed in the Hall of Fames of Google, AT&T, MailChimp, Coinbase, PayMill, ConstantContact, Viadeo, GitLab, Wizehive, Snappy, and Sellfy.
The guy behind bugsheet.com
https://twitter.com/mushti
http://www.bugsheet.com/