I have a SP2013 site collection with several subsites for different user groups that should not be aware of each other. I have made task lists to every subsite and everything seemed to be fine until I opened a task list with "Open with Access". Creating a local (linked) copy of a task list allows me to see the UserInfo table for the whole site collection, even with only View rights.
How do I prevent users from accessing the user information table completely or limit the scope of the table to the subsite in question?