Security researcher Uber0n, has submitted on 22/03/2009 a cross-site-scripting (XSS) vulnerability affecting apps.facebook.com, which at the time of submission ranked 5 on the web according to Alexa.
We manually validated and published a mirror of this vulnerability on 22/03/2009. It is currently unfixed.
If you believe that this security issue has been corrected, please send us an e-mail.