Make an XSS Payload to Read document.body from a Vulnerable Website

In this lesson, we'll learn how to exploit an XSS vulnerability to read the contents of the page body from a vulnerable site, capturing whatever sensitive information is on the page, and sending it back to our attacker website for further exploit. This will effectively show that XSS must be completely stopped, rather than stopping a specific type of exploit such as cookie theft via XSS like in our previous lesson.