Lab: DOM XSS in jQuery anchor href attribute sink using source


This lab contains a DOM-based cross-site scripting vulnerability in the submit feedback page. It uses the jQuery library's $ selector function to find an anchor element, and changes its href attribute using data from

To solve this lab, make the "back" link alert document.cookie.


  1. On the Submit feedback page, change the query parameter returnPath to / followed by a random alphanumeric string.
  2. Right-click and inspect the element, and observe that your random string has been placed inside an a href attribute.
  3. Change returnPath to:


    Hit enter and click "back".

Community solutions

Michael Sommer