T-Mobile US—T-Mobile suffered data breach affecting 47.8 million customers, exposing SSNs, dates of birth, and driver's license information
In March 2026, T-Mobile confirmed a data breach affecting 47.8 million people including current, former, and prospective customers. Approximately 7.8 million current postpaid customer records were stolen, ~40 million former/prospective customer records, and 850,000 active prepaid customers had phone numbers and account PINs exposed. Exposed data included names, dates of birth, Social Security numbers, and driver's license/ID information. T-Mobile discovered the breach through an online forum post and shut down the leak.
Scoring Impact
| Topic | Direction | Relevance | Contribution |
|---|---|---|---|
| Data Security | -against | primary | -1.00 |
| User Privacy | -against | primary | -1.00 |
| Overall incident score = | -0.572 | ||
Score = avg(topic contributions) × significance (critical ×2) × confidence (0.57)× agency (negligent ×0.5)
Evidence (1 signal)
Security Boulevard confirmed T-Mobile data breach affecting 47.8 million customers with SSN and driver's license exposure
Security Boulevard reported T-Mobile confirmed a breach affecting 47.8 million people. 7.8M current postpaid records stolen, ~40M former/prospective records, and 850K prepaid PINs exposed.