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Hi David, "nice" is an understatement here. I've done some testing with this one and, while there /are/ quirks, it most definitely works. It even bypasses standard HTTP-to-HTTPS restrictions. As long as the page(s) being framed don't contain X-Frame-Options headers (with `deny` or `same-origin` values), it executes successfully. Pending the payload being injected, most Content Security Policies are also bypassed (by injecting HTML instead of JavaScript, that is). It looks like, through this method, all viable XSS tactics are open! Nice find! Has this been reported to Microsoft outside (or within) this thread? -- Joey Fowler Senior Security Engineer, Tumblr On Sat, Jan 31, 2015 at 9:18 AM, David Leo <david.leo () deusen co uk <mailto:david.leo () deusen co uk>> wrote: Deusen just published code and description here: http://www.deusen.co.uk/items/__insider3show.3362009741042107/ <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 <http://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 <http://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 If you like it, please reply "nice". Kind Regards, _________________________________________________ Sent through the Full Disclosure mailing list https://nmap.org/mailman/__listinfo/fulldisclosure <https://nmap.org/mailman/listinfo/fulldisclosure> Web Archives & RSS: http://seclists.org/__fulldisclosure/ <http://seclists.org/fulldisclosure/>