This tweet introduces an XSS payload that is designed to bypass Microsoft's 2025 Web Application Firewall (WAF). The payload is an HTML input element of type checkbox with a unique ID and value, styled to be hidden with CSS 'display:none'. The peculiar part of this payload is the use of '&%2362;=""' within the input tag, which encodes the '>' character in an encoded manner, potentially evading WAF detection. The onchange event triggers a JavaScript function that calls an alert displaying the current location's hostname. Upon execution, the input element removes itself from the DOM. A label with fixed position encompassing the viewport is associated with the checkbox, allowing user interaction. This bypass technique leverages encoding tricks to evade security filters and execute JavaScript code, which demonstrates a method to bypass Microsoft's 2025 WAF protection. The tweet reference to 'https://t.co/LfuPE5mcac' is likely an example or a further explanation link.
For more insights, check out the original tweet here: https://twitter.com/xss0r/status/1945754386875220190