faster than light - How would wormhole-based FTL violate causality?

We already have an answer why physically traveling faster than light would violate causality (the clock on board our hypothetical FTL spaceship would tick backwards to some outside observers).

However, would a wormhole-based FTL violate causality? In this case, never does an object actually move faster than light.

If this violated causality, then how could I send back information from, let's say, 2014 Earth to 2004 Earth?