Client-local data that is displayed in the browser window can be made available to the server by using a redirect to a Javascript applet running in the same window. This in effect bypasses cross-domain security and makes the data available to the applet, which could then send the data to a hostile server. This could allow a malicious web site operator to read the contents of files on visiting users' computers, if he or she knew the name of the file and the folder in which it resided. The vulnerability would not allow the malicious user to list the contents of folders, create, modify or delete files, or to usurp any administrative control over the machine.

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