T-Mobile US said on Friday that its ongoing investigation into the data breach revealed hackers accessed the personal information of an additional 5.3 million customers, bringing the total number of affected people to more than 53 million. The third-largest US wireless carrier said earlier this week that the personal data of more than 40 million former and potential customers had been stolen, along with data from 7.8 million existing T-Mobile Wireless customers.
In its latest update, which comes days after the US Federal Communications Commission (FCC) opened an investigation into the breach, T-Mobile revealed that it had identified 5.3 million additional wireless customers who were affected by the breach as well as The former had 667,000 more accounts. Customer. The data includes addresses, dates of birth and phone numbers of customers, the company said, adding that there is no indication that the accessed data includes financial information such as credit cards or other payment data.
Some T-Mobile customers sued the company for damages in Seattle federal court late Thursday, in a proposed class action saying the cyberattack violated their privacy and put them at a high risk of fraud and identity theft. be exposed. Wireless carriers are the latest victims of cyberattacks on large corporations in the United States as hackers exploit vulnerable user system privacy and security due to work-from-home policies established since the start of the coronavirus pandemic.
In 2018, the company was notified of a potential security breach that could affect about 3 percent of its 77 million customers.
Doug Schmidt, professor of computer science at Vanderbilt University, said, “T-Mobile has had 6 other data breaches in the past 4 years. It appears that their IT system is particularly vulnerable because they haven’t been able to repair it. Known security issues during the time period that should be customer related.”
T-Mobile said in a regulatory filing Friday that while the investigation was ongoing, it believed it had “closed access.”
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