2021 T-Mobile breach — 50M+ records
Data compromised
Names, Social Security numbers, Dates of birth, Driver's license numbers, Internal documents
Technical writeup
An attacker accessed T-Mobile's systems and exfiltrated customer data including names, DOBs, SSNs, driver's license info, and IMEI numbers. Data was offered for sale on the dark web.
Root cause
Unauthorized access to internal systems; inadequate access controls and monitoring.