How I hacked chess.com with a rookie exploit

Rook to XSS: How I hacked chess.com with a rookie exploit.
Playing Chess is one of the many hobbies I like to do in my spare time, apart from tinkering around with technology. However, I’m not very good at it, and after losing many games, I decided to see if I could do something I’m much better at; hacking the system!

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