[xwiki-users] Strange new Users on my XWiki

Hi I just realized that I have a bunch of new users all created with the same first and last name. I saw one with the same name 'Kunstkamera' being created also on the XWiki.org (or at least I thought so). Any idea what is going on. Is there someone trying to spam XWiki's and is there anything to be of concern as an administrator? Which leads me to another concern: Every Import of the Enterprise XAR file is reseting the Admin password to the default. Is there anyway to prevent that because in the heat of the upgrade procedure that gets easily overlooked ? Cheers - Andy