The tweet talks about a professional bug bounty hunter who found a complex vulnerability involving a 2 click XSS attack. This attack leads to multiple severe issues: Account Takeover (ATO), Personally Identifiable Information (PII) leakage, bypassing Content Security Policy (CSP), and bypassing a Web Application Firewall (WAF). This implies that the XSS vulnerability is sophisticated and can evade common security measures like CSP and WAF protections, which are usually implemented to prevent such attacks. The vulnerability was discovered on the main page and main function of a top 10 bug bounty program (BBP), highlighting the importance of deep testing and exploration in security assessments. The tweet gives hope and encouragement to new bounty hunters, as the user recently started professional bug hunting and quickly found a critical chain of bugs.
Check out the original tweet here: https://twitter.com/Fcracker_hunter/status/1953850388941079000