A vehicle includes a front pillar and a rear pillar spaced along a vehicle-longitudinal axis. The front pillar and the rear pillar define a door opening therebetween. The vehicle includes a first track on the front pillar and a second track on the rear pillar. A cable is moveably engaged with the first track and the second track from an undeployed position to a raised position. The cable extends across the door opening from the first track to the second track in the raised position. An airbag is moveable with the cable from the undeployed position to the raised position. The airbag is supported by the cable in the raised position.