2010/10/25 Marco Schuster marco@harddisk.is-a-geek.org:
The admin in question doesn't even have to visit Wikipedia directly, there are enough pages hotlinking to upload.wikimedia.org, which should cause the browser to transmit session data.
Actually it won't, because upload.wikimedia.org is a cookieless domain. As opposed to other domains like wikipedia.org and wikibooks.org , wikimedia.org doesn't get domain-wide cookies either, because there are wikimedia.org subdomains not controlled by WMF.
Roan Kattouw (Catrope)