They fixed the security holes that allowed hackers to gain access to all their users' private data and sent an email to every person with an account on Kickstarter.com urging everybody to change their password as it is no longer secure. As of now more details regarding the hack were not made public.
Kickstarter however swears that the hackers did not get their hands on any credit card information. They also mentioned that all users' passwords were encrypted but did not specify what kind of encryption algorithm they use so it can be anybody's guess how long it could take to break the encryption and find out the plain-text passwords of all the stolen accounts.
The company was assaulted with questions after users found out Kickstarter waited several days until it informed them about what happened. Kickstarter issued a public apology and even added a FAQ section to answer questions from its members.