Kickstarter co-founder Yancey Strickler says hackers accessed usernames, email addresses, phone numbers and passwords. The passwords are encrypted, but Kickstarter says it is possible for a hacker to guess a weak or obvious password.
Kickstarter says hackers did not get credit card information. It says two accounts have had unauthorized transactions.
Kickstarter Inc. is one of dozens of crowdfunding websites that let people raise money from donors for projects. Kickstarter projects have included a Spike Lee movie, local breweries and charitable causes.
Kickstarter disclosed the breach Saturday on its blog after learning about it from law enforcement on Wednesday. It says it closed the security breach right away.