[xwiki-users] Xwiki User profiles publicly accessible

Hi There, I’ve noticed that an XWiki installation has its user directory as well as full user profiles openly accessible to the public. Is this not a huge security risk? Or am I missing a configuration setting somewhere? For example, http://www.xwiki.com has all its users publicly accessible here: http://www.xwiki.com/lang/en/Main/UserDirectory and each user’s complete personal profile details is viewable. Is there a way to secure this information? Thanks, Werner