Creating a learning environment that is both fun and safe is essential to our goal of spreading quality computer science education.

Report a Bug or Vulnerability

If you have discovered a bug or vulnerability in the site, please don't hesitate to contact us at We appreciate any help or information that you can give as we find and fix website bugs.

When reporting a vulnerability or bug, please include information on the nature of the vulnerability and steps to reproduce it.

Hall of Fame

The following security researchers have alerted us to bugs and vulnerabilities in the site. Their timely and detailed reporting has helped improve CodeHS. Many thanks to all the researchers and bug hunters!