eBay was the victim of a recent cyberattack and is now asking millions of customers to change their passwords. The company says that a database containing encrypted passwords was compromised, but there is no evidence yet that there was any unauthorized activity or that any financial or credit-card information was stolen. eBay did not list the number of accounts affected but said the number could be big; eBay has 145 million active users. The hackers stole employee log-in credentials, and hacked the company between late February and early March, but weren’t detected until two weeks ago. eBay also owns the payment serve PayPal, but says there is nothing to show that PayPal was affected.