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PHPNuke Event Calendar contains a flaw that allows a remote cross site scripting attack. This flaw exists because the application does not validate the "type", "day", "month" and "year" variables upon submission to the "modules.php" script. This could allow a user to create a specially crafted URL that would execute arbitrary code in a user's browser within the trust relationship between the browser and the server, leading to a loss of integrity.
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