looks like just a vigorous fermentation. I would just clean out and replace the airlock, and think about getting a blow-off tube for further batches. Its not a big deal, I have had a few batches blow through the airlock, and they all turned out fine. With that vigorous of a fermentation, everything is pushing out, so nothing should be able to get in. Also, The Kraeusen forms a barrier to nasties getting in, thats why open fermentation is still able to produce a good beer with attention paid to sanitation.
Long Story Short, RDWHAHB (Relax, Don't Worry, Have a Homebrew) or commercial beer in your case.