Bumping ships, that are located within password protected starbase force-fields, out of the force-field from outside without having the correct password or corporation/alliance permissions as configured in the tower settings, is considered an exploit. 

Attempts to bypass the game mechanics of starbase force-fields are fully visible in server logs to CCP Games’ staff and will result in appropriate action taken against the involved user accounts as per the EVE Online Suspension and Ban Policy from here on.

Pro tip:

In order to prevent problems with ships being bumped out of a starbase force-field from inside, by accident or by intention by players with legitimate access, owners are advised to park them in Ship Maintenance Arrays. X-Large Ship Maintenance Arrays were made available without the need for sovereignty with the Odyssey expansion so this option should be available to everyone.