Hackers gained unauthorized access to Kickstarter around Feb. 12, but no credit card data "of any kind" was stolen by intruders, CEO Yancey Strickler announced via the site.
Only two Kickstarter accounts are showing unauthorized activity, Strickler said. After learning of the hack, Kickstarter officials "immediately closed the security breach." Although no credit card data was stolen, the site is recommending users change their passwords immediately.
"Accessed information included usernames, email addresses, mailing addresses, phone numbers and encrypted passwords," Strickler wrote. "Actual passwords were not revealed, however it is possible for a malicious person with enough computing power to guess and crack an encrypted password, particularly a weak or obvious one."
The CEO adds that Kickstarter is currently working with law enforcement and doing everything it can to prevent future breaches.
"We're incredibly sorry that this happened," Strickler wrote. "We set a very high bar for how we serve our community, and this incident is frustrating and upsetting. We have since improved our security procedures and systems in numerous ways, and we will continue to do so in the weeks and months to come."