>If the exploiter can get whatever javascript he wants to execute on
>your system without your approval merely by sending you an email
>message, then he doesn't need a referer header to do mischief.

O.k.

>The only potential issues I can imagine with the referer header would
>be _privacy_ issues, not _security_ issues.  For example, if the
>target site could read cookies set by the site referenced in the
>referer header, that would constitute a potential privacy issue.  But
>it would not be an exploit in the sense of allowing your system to be
>exploited or compromised.

Some sites write user name and password or a session ID into the URL,
and under some circumstances some version of IE sends this URL as a
referer not only to pages which are linked on the initial page but to
others, too.

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