The tweet discusses a WAF bypass capability of the KNOXSS tool for XSS vulnerabilities. The tool boasts features like Automatic Blind XSS, DOM-based XSS, Filter/WAF Bypass, (Weak) CSP Bypass, and unique payloads. It has been acknowledged by many users in the security community. This bypass could potentially help in evading WAF protection against XSS attacks. More details can be found by checking the tool's timeline and signing up for it. #BugBounty
Check out the original tweet here: