60SecondsInAfrica's blog

By 60SecondsInAfrica, history, 8 months ago, In English

Dear Codeforces community. recently, kostia244 found out that codeforces parses custom CSS & HTML in this comment: https://codeforces.com/blog/entry/82468?#comment-693536

This could potentially be exploited by putting a malicious URL to steal a user's cookies and login sessions. Obviously making a PoC would be illegal but I would like to discuss whether or not that's even possible, and if so notify the admins to fix.

This is could be dangerous, this text is not even a part of the image

https://www.mike-gualtieri.com/posts/stealing-data-with-css-attack-and-defense

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