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To the left of the wiring harness there is another wire loom that enters the cabin. There does no appear to be any waterproof grommet that might prevent moisture from migrating from the engine bay to the CE area.
Should I be worried that water will enter the cabin from this hole?
Is there something missing that would prevent the water for going in the cabin?
Here is a picture of the firewall holes. All three have rubber "grommets". The one furthest to the passenger side is the entry for the ABS harness and that harness has a rubber grommet on the harness itself. It does slide fairly easily along the ABS harness, so possibly it has been pushed back in on the cabin side.