WHAT: Approximately 200,000 Citibank credit card customer names, account numbers and email addresses were stolen by hackers who broke into Citi’s online account site.

HOW BAD: The hackers couldn’t get into customer Social Security numbers, birth dates or card expiration dates and security codes — more information needed for identity theft.

WHAT’S BEING DONE: Citi will replace the hacked cards, because victims’ account details and linked financial data could be acquired by using the stolen account information.