Kickstarter, the crowdfunding platform, has admitted it was hacked on 12 February but has also said no credit card data was accessed.
The company said that while the breach did not reveal credit card numbers, the personal data of millions of users could be at risk.
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Kickstarter CEO Yancey Strickler said: "While no credit card data was accessed, some information about our customers was. Accessed information included usernames, email addresses, mailing addresses, phone numbers, and encrypted passwords.
"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."
Kickstarter suggested that all its users change their passwords as a precaution and consider using password management services.
The platform says it is the biggest crowdfunding site in the world and has collected money from 5.6m people, representing an attractive target for hackers.
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By GlobalDataStrickler said: "We’re incredibly sorry that this happened. 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."
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