It seems that twitter new site introduced some issue resulting in a worm exploiting a stored Xss.
They also added some new JavaScript in their pages which I casually saw while searching in the html for the worm payload.

The code was the following :

//<![CDATA[
(function(g){var a=location.href.split("#!")[1];if(a){g.location=g.HBR=a;}})(window);
//]]>

Do you spot the issue?
It search for "#!" in the Url and assign the content after that to the window.location object. And it is present in (almost?) every page on twitter.com main site.

...Continue the reading on Minded Security blog Here

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