Board Thread:Legitimate Canon Questions/@comment-25176701-20140719113429/@comment-4091815-20140719172259

So far - we've only seen they have two weaknesses in common -

Wolfsbane and the loss of control during the full moon.

We've not seen Malia face mountain ash so we don't know for sure. Kanima Venom is not like to come up any time soon so we don't know that either.

Mistletoe is a poison for humans and animals and is not a specific weakness to werewolves.