Transcript for Marriott says data breach may affect up to 500 million Starwood hotel guests
This is one of the largest data breaches we've seen today as many as 500 million people may have had their information still win. After Marriott says someone got into the systems that handle customer data. Back in 2014. I had that hacking ever sense getting access to people's names addresses birth dates. Even passport numbers really important to stay on top of this type of preached where the information can't just rattling he changed you're not gonna go out and get a new passport number despite high cost to you experts say the cost of your information. This typically only worth about ten bucks to a hacker. When they steal information from hundreds of millions of people. That's up to quite a payday. Now the New York attorney general's announcing that her office is investigating the breach tweeting that New Yorkers deserve to know that their personal information will be protected. The banks that we work with the company's that we spend our money with the retailers that we go to wanna daily basis. They are literally spending billions of dollars a year to try to protect customers from these data breaches and yet they're still happening. In a statement Mary outs president said we deeply regret this incident happened and we are doing everything we can to support our guests and using lessons learned to be better moving forward. The company says it's working with ma enforcement as well as leading security experts to investigate and address the breach. Merry on also said it will be reaching out to customers but experts warn that with this type of hackers often a second set of spammers. Those pretending to be the company. So if you get a call or email from someone who say is there with Mary Ott. As birthday to tell them you'll call him back on the company's main phone line. Accurately ABC news New York.
This transcript has been automatically generated and may not be 100% accurate.