eBay wants its users to change their passwords after a cyber-attack compromised its systems.
The internet auction company said a database, which contained encrypted passwords and other non-financial data, was hacked between late February and early March.
The company added that it had no evidence of there being unauthorised activity on its members' accounts.
However, it said that changing the passwords was would help enhance security for eBay users.
The BBC reports eBay has 128 million active users and accounted for $US212 billion worth of commerce on its various marketplaces and other services in 2013.
It said it would be contacting users to alert them via email, its website, adverts and social media.
A post on eBay's corporate site said the company became aware of the attack only a fortnight ago.
"The database ... included eBay customers' name, encrypted password, email address, physical address, phone number and date of birth," it said.
"However, the database did not contain financial information or other confidential personal information.