T-Mobile Says Hack Exposed Personal Data of 40 Million People

T-Mobile Says Hack Exposed Personal Data of 40 Million People

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A cyberattack on T-Mobile exposed the information of more than 40 million people, with stolen files including names, birthdays and social security numbers, the company said on Tuesday.

The mobile service provider said in a statement that it had been investigating the data breach since last week, when it was “informed of claims made in an online forum that a bad actor had compromised T-Mobile systems.”

The company said the stolen files included information from approximately 7.8 million current T-Mobile accounts, as well as records of more than 40 million former or prospective customers who had applied for credit with the company.

Some of the exposed data included customers’ first and last names, social security numbers, driver’s license and other information, T-Mobile said. It also included the PINs of about 850,000 active prepaid customers, leading the company to reset some account information.

T-Mobile said that no phone numbers, account numbers or passwords were compromised for current or prospective customers, and that there was no indication that financial, credit card or other payment information had been stolen.

The company said it had “immediately closed” the access point in its computer system that it believed was targeted by the cyberattack.

T-Mobile announced it was investigating claims that data was “illegally accessed” on Monday, a day after Vice reported that a vendor in an online forum was trying to sell $270,000 worth of stolen information obtained from T-Mobile servers. The mobile company confirmed on Tuesday that customer data was affected.

T-Mobile, like other major corporations, has struggled to stave off hackers and prevent data breaches. In 2018, T-Mobile suffered a security breach that compromised personal information of as many as two million customers, including phone numbers, email addresses and account numbers. In 2019, the company’s email vendor was hacked, revealing some customer and employee personal information.

In response to the breach, the company said it would offer two years of free identity protection services. T-Mobile did not immediately respond to questions about updates to its security systems.

The breach was just one of many cracks in cybersecurity across multiple industries exposed in recent years. Experts repeated concerns on Wednesday that, more and more, companies and institutions do not have the necessary security protocols in place to protect sensitive information.

Recent cyberattacks around the world have taken down operations at gasoline pipelines, hospitals and grocery chains, and have potentially compromised some intelligence agencies. Large financial companies face hundreds of thousands of cyberattacks every day, and sometimes fail to stop them.

“The security programs most companies have are just struggling to keep up,” Daniel Miessler, an information security expert and tech writer in San Francisco, said in an interview. He added that, given the complexity of running a major telecom business and the difficulty in keeping data secure, he was surprised the public did not see more major breaches more often.

Companies that collect information that can be sold on black markets, like consumer data, will always be susceptible to hacks, said Cherise Esparza, a co-founder of Security Gate, a cybersecurity firm. But most companies tend to address blind spots retroactively, or scramble to defend themselves only after a competitor suffers a hack.

“People are starting to see their peers getting hacked, and they don’t want to be in the news,” Ms. Esparza said. But she added that, for many companies, data security drifted as a priority.

“Innovation usually trumps security,” Ms. Esparza said. “We are so fast as a country to create, innovate and adopt new technologies that oftentimes security is the last step, or even overlooked.”


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