Marriott just announced this week that it learned of a security breach from four years ago, and 500 million users are affected. For 327 million guests, the exposed information include names, phone numbers, email addresses, passport numbers, and arrival and departure information. For millions of others, credit card numbers and expiration dates were compromised. Marriott says it will begin emailing guests affected by the breach.
If you go to answers.kroll.com, you can read their story and what they're doing. They're also going to give users free monitoring for a year.
Read more at bloomberg.com.