The popular online bidding site eBay is urging its customers to change their passwords after hackers managed to slip into one of its databases months ago. In a posting on the company’s website, eBay said a cyber-attack “compromised a database containing encrypted passwords and other non-financial data.” Hackers broke into the database “between late February and early March,” but eBay didn’t detect a problem with employee log-in credentials — which the hackers had hijacked — until about two weeks ago, the statement said. The company assured customers that it’s seen “no evidence of any unauthorized access to financial or credit card information, which is stored separately in encrypted formats.” “However,” the company said, “changing passwords is a best practice and will help enhance security for eBay users.”