T-Mobile Denies Data Breach While Exposing Few Customer Data in a System Glitch

Mobile telecom company, T-Mobile denied claims of being breached a third time this year. The incident came to light, when a threat actor going by the alias ’emo’ posted the leaked data on BreachForums for free.

The 90GB exfiltrated data posted on the hacking forum includes employee IDs, job titles, departments, rehire and termination dates, address, partial Social Security Numbers, email addresses, customer data, and other information.

However, T-Mobile has denied the alleged claim stating that the leaked data belongs to one of its authorized retailers. ‘’[..] The data being referred to online is believed to be related to an independently owned authorized retailer from their incident earlier this year. T-Mobile employee data was not exposed,’’ the company revealed.

By naming the post, ‘’T-Mobile | Connectivity Source (one of T-Mobile’s authorized retailers),’’ the hacker does connect the breach to both the companies; the post however claims the stolen data belongs to T-Mobile.

The news was first shared by malware researchers VX-Underground, who in tweets on X (formerly Twitter) claim the expose to be a result of T-Mobile’s April 2023, breach.

Over the years, the telecom giant has been breached several times. ‘’This is T-Mobile’s 8th breach since 2018,’’ VX-Underground states.

In addition to the hacking incident of last week, T-Mobile also suffered a system malfunction that accidentally exposed personal information of its customers. The breach was noticed when some customers complained about the issue on Reddit and X.

The posts mentioned that upon logging into the company’s app, customers could view other customers’ personal information, including plan and financial details. Regarding the incident, the company disclosed that the leak was due to an overnight update and involved less than 100 customers’ information.

Both the breach incidents either involve customer or employee information, which can be used by threat actors to commit financial frauds, send targeted phishing emails, or SMS messages.