This is only an issue if you use cookies to authenticate JSONP requests, which you shouldn't do. I wrote a summary of the issues with JSONP on StackOverflow aw

This is only an issue if you use cookies to authenticate JSONP requests, which you shouldn't do. I wrote a summary of the issues with JSONP on StackOverflow awhile ago: http://stackoverflow.com/a/1392153 http://stackoverflow.com/a/1392153