If you're going to go hack on a company, make sure you have some legal protection first. Check disclose.io or the company's website (look for a security.txt!) to make sure there's some sort of safe harbor provision, or a pre-existing vulnerability disclosure program or bug bounty program that allows you to do this kind of testing.
If you're not going to do that, then disclose the vulnerability anonymously and cover your ass while you're testing, or just don't.
Meanwhile if you're an American please write your local representative and express your displeasure with the antiquated, overly-simplistic CFAA and ask them to support initiatives to have it replaced or removed.