T-Mobile announces another data breach, impacting 37 million accounts


The attacker obtained buyer names, billing addresses, emails, cellphone numbers, and delivery dates by means of an inside API.

Illustration of the T-Mobile logo, the letter T in a pink box with two squares on either side of it, in front of a blue and aqua background.

a:hover]:text-gray-63 text-gray-63 darkish:[&>a:hover]:text-gray-bd darkish:text-gray-bd darkish:[&>a]:text-gray-bd [&>a]:shadow-underline-gray-63 [&>a:hover]:shadow-underline-black darkish:[&>a]:shadow-underline-gray darkish:[&>a:hover]:shadow-underline-gray”>Illustration by Alex Castro / The Verge

T-Cellular has revealed the corporate’s second main breach in lower than two years, admitting {that a} hacker was capable of acquire buyer information, together with names, delivery dates, and cellphone numbers, from 37 million accounts. The telecom large mentioned in a regulatory filing on Thursday that it at the moment believes the attacker first retrieved information round November twenty fifth, 2022, by means of considered one of its APIs.

T-Cellular says it detected malicious exercise on January fifth and that the attacker had entry to the exploited API for over a month. The corporate says it traced the supply of the malicious exercise and stuck the API exploit inside a day of the detection. T-Cellular says the API utilized by the hacker didn’t permit entry to information that contained any social safety numbers, bank card data, authorities ID numbers, passwords, PINs, or monetary data.

In a public press release asserting the breach, T-Cellular omitted that the breach impacted 37 million accounts and that it had gone undetected for over a month. As an alternative, the assertion expressed the corporate had “shut it down inside 24 hours” as quickly as its groups had recognized the problem. T-Cellular has began to inform clients whose data might have been obtained within the breach.

“Our investigation continues to be ongoing, however the malicious exercise seems to be totally contained right now,” the corporate mentioned within the submitting. “There may be at the moment no proof that the dangerous actor was capable of breach or compromise our techniques or our community.”

T-Cellular has disclosed eight hacks since 2018, with earlier breaches exposing buyer name data in January 2021, credit score software information in August 2021, and an “unknown actor” accessing buyer information and executing SIM-swapping assaults in December 2021. In April last year, the hacking group Lapsus$ stole T-Cellular’s supply code after buying staff’ credentials on-line.


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