Short answer is - no, they can’t.
Basic users, who are able to submit and edit their own items, are unable to view items submitted by other users.
Nor do basic users have the ability to edit account settings, create expense reports, set supplier rules or publish items.
It’s easy to control how much access a user has; you can choose their level of access when you’re creating the user, or later on via the 'Manage button' in the 'Maintain users' panel. Changing access levels can be useful for managing the activities of your clients and that of your employees.