SWTOR gradually responds to Update 5.6 credit exploit
Apparently the exploit involves a companion gift vendor who was selling wares for far below normal along with the auction house, which was used for credit laundering purposes.
The studio did acknowledge the exploit and said that it was taking action, although sorting this mess out is taking time: “We have already begun taking action against players, but the brunt of those actions are still to come. As you might imagine, gathering all of the data to understand who exploited and what they did with the money, takes quite a bit of time. Know that over time we will be applying account actions, along with removing a large quantity of credits and other ill-gotten gains.”