If an outdoor outlet is mounted flush and the cabling direct through the wall, can I use indoor cabling?
Although it's done that way all the time, it's my opinion that if the box is in a wet location, the cable inside the box must be rated for wet locations.  Sometimes an easy way to comply is set a box just inside the building, and transition from NM to UF in the indoor box, send the UF out to the outdoor box.