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!This blog post is about how I used my cybersecurity knowledge to find XSS on the #1 chess site on the internet, with a user base of over 100 million members - Chess.com. But first, a bit of preface (that includes a slightly less serious, al...