This tweet describes a bypass technique for a Web Application Firewall (WAF) where the WAF was blocking the payload that included '//' sequences. The researcher found a way to tweak the payload to bypass the WAF's filter and successfully execute a cookie-stealing Cross-Site Scripting (XSS) attack. The exact payload is shared in the tweet comments but not included in the tweet itself. This technique shows how attackers can manipulate WAF rules that block specific characters or sequences to bypass security and perform malicious actions like stealing cookies via XSS. It highlights the importance of robust WAF configurations and thorough testing against payload variations to prevent such bypasses.
Check out the original tweet here: https://twitter.com/Harsh25NN/status/1957835732682150191