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Washington sues T-Mobile over 2021 data breach that spilled 79 million customer records


The 2021 breach affected at least 2 million Washington state residents, and tens of millions more customers around the United States.

The hack against T-Mobile in August 2021 was the latest in a series of data breaches at the company over recent years, with at least five security incidents dating back to 2018 by TechCrunch’s count. The breach allowed a hacker access to T-Mobile’s systems and exfiltrated customer names, dates of birth, and Social Security numbers, as well as driver’s license information. The complaint also says T-Mobile did not implement rate-limiting on any login attempts, allowing the hacker to freely test as many credentials without locking the employee accounts in question.

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