Hi!
I think this is a XSS in MS SharePoint, you can reproduce it in SharePoint test
server using for example following url:
http://www.example.com/sharepoint/default.aspx/%22);}if(true){alert(%22qwertytis
This is due a lack of string stripping when putting the path into javascript.
It seems to work at least on every main page.
I tried to check for this in the web, but I didn't found this hole anywhere.
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Regards,
Solarius - http://www.solarius.name