It is also possible (especially since you have water in the rear footwell too) that the butyl rubber sealant which holds the plastic weather liner to a metal door shell has shrunken over time or been improperly reinstalled. This can result in water coming over the sill trim from underneath the door trim panels and is easy to spot, and to fix with the door panel off. Theres a water flow path inside the door and the liner seal is important because the window trim does not stop water from flowing through the door. Check drain holes at bottom of door shells as well, and clear if clogged. I can tell everyone is getting rain like we have lately or worse. Lotsa water leaks!