Security researcher 189, has submitted on 19/03/2011 a cross-site-scripting (XSS) vulnerability affecting duckduckgo.com, which at the time of submission ranked 5799 on the web according to Alexa.
We manually validated and published a mirror of this vulnerability on 13/12/2011. It is currently unfixed.
If you believe that this security issue has been corrected, please send us an e-mail.
Vulnerable URL: http://duckduckgo.com/?q=%3Ciframe+src%3D%27http%3A%2F%2Fxssed.com%2F%27%3E%3C%2Fiframe%3Eporn