The "Save for Web" selection in QuickTime Player in Apple Mac OS X through 10.6.8 exports HTML documents that contain an http link to a script file, which allows man-in-the-middle attackers to conduct cross-site scripting (XSS) attacks by spoofing the http server during local viewing of an exported document.
http://www.securityfocus.com/bid/50122
http://www.securityfocus.com/bid/50085
http://support.apple.com/kb/HT5016
http://support.apple.com/kb/HT5002
http://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html