The tweet mentions that the WAF is blocking the keyword 'javascript:alert' and similar keywords. The bypass payload used is 'jaVasCript:alert(1)'. This indicates a potential XSS vulnerability being blocked by the WAF. The user is looking for a way to bypass the WAF blocking by possibly cutting the keywords and adding them later in the code. This raises concerns about input validation and filtering mechanisms in the application. It is important to address this vulnerability to prevent malicious attacks.
Original tweet: https://twitter.com/xqd/status/1817257677333926215