2011 — Wells Fargo: A mailing error exposed customer bank account…
Data compromised
Personal information
Technical writeup
A mailing error exposed customer bank account information to other customers. Pages from other customer accounts which included bank account numbers, balances, and transactions were accidentally mailed to other customers in September paper statements. The error was caused by a printer malfunction. Wells Fargo temporarily took the printer out of service after the breach was discovered. At least 50 customers noticed the problem.
Root cause
Unintended disclosure