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PHPOpenChat contains a flaw that allows a remote cross site scripting attack. This flaw exists because the application does not validate user-supplied input to the 'disinvited_chatter' and 'invited_chatter' fields upon submission to the 'invite.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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