Deusen just published code and description here: http://www.deusen.co.uk/items/insider3show.3362009741042107/ which demonstrates the serious security issue.
Summary An Internet Explorer vulnerability is shown here: Content of dailymail.co.uk can be changed by external domain.
How To Use 1. Close the popup window("confirm" dialog) after three seconds. 2. Click "Go". 3. After 7 seconds, "Hacked by Deusen" is actively injected into dailymail.co.uk.
Technical Details Vulnerability: Universal Cross Site Scripting(XSS) Impact: Same Origin Policy(SOP) is completely bypassed Attack: Attackers can steal anything from another domain, and inject anything into another domain Tested: Jan/29/2015 Internet Explorer 11 Windows 7
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