MailSite contains a flaw that allows a remote cross site scripting attack. This flaw exists because the application does not validate variables upon submission to the 'WCONSOLE.DLL' 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.
Currently, there are no known workarounds or upgrades to correct this issue. However, Rockliffe has released a patch for MailSite 6.1.22 to address this vulnerability.