Could be the w/o on the tub. But I'll bet it's in the bathroom.
Take the spout and escutcheons off and clean up the wall. Seal the holes with plumbers putty and reinstall.
Then clean and dry the whole area and with a small sponge or nice cotton rag, wipe in some polyseamseal calk around those fittings. Wipe it in nice and neat..
The other weak spot is you, your curtain or shower door.
Keep the floor dry.
Water doesn't have to puddle so look real close to the front part of the apron of the tub and see if you see water during or after showering.