Abstract of the paper;Cross site scripting (XSS) attacks are considered one of the most dangerous attacks. When an application accepts un-validated user inputs and sends it back to the browser without validation, it provides attackers with an opportunity to execute malicious scripts in victim users browsers. By using this attack vector, malicious users can hijack user accounts, deface websites, carry out phishing attacks etc .XSS shell is a cross domain tool to carry out XSS attack in more controlled manner. It is used to setup a channel between attacker and victims browser and controlling the victims browser.