You should be able to pull it out from the outside. Remove the center screw and then there should be 2 screws to remove to pull the outlet out. Depending on how AS was that day you may only have a small amount of wire for slack. Replace the outlet, recommend with a water resistant one with a weather resistant outlet cover.
The outlet in there has a closed back rv type that aren't available any more for that spot so I used a standard outlet and wrapped it in heavy duty electrical tape about enough to kill a horse.
Otherwise to get to it from the back you'll have to remove wheel well cover and anything between you and said ability to remove the wheel well cover.