Planner Leak Allows External Recipients to Receive Task Comments

An unfortunate problem in the Office 365 Planner app allows external recipients to be added to to email so that they receive and see comments posted for tasks. Although this doesn’t sound like such a big problem, it is because it can lead to confidential information leaking outside the organization in an uncontrollable manner. Microsoft support says that Planner is working by design. We don’t believe that this could possibly be the case.