hijacked

1. To forcibly stop and seize control of some vehicle in order to rob it or to reach a destination (especially an airplane, truck or a boat).
2. To seize control of some process or resource to achieve a purpose other than its originally intended one.
3. To seize control of a networked computer by means of infecting it with a worm or other malware, thereby turning it into a zombie.
4. To change software settings without a user's knowledge so as to force that user to visit a certain web site (to hijack a browser).
5. To introduce an amendment deleting the contents of a bill and inserting entirely new provisions.

adjective

Of a vehicle, aircraft, vessel, computer, etc.: whose control has been seized by force