2013 — Citigroup: Citigroup exposed the Social Security numbers,…
Data compromised
Personal information
Technical writeup
Citigroup exposed the Social Security numbers, dates of birth, and other sensitive information of customers by not properly redacting the information for court records. Consumers who went into bankruptcy between 2007 and 2011 were affected. The incident was discovered by the bank on April 2011. Roughly 146,000 consumers were notified of the breach in July of 2013.
Root cause
Unintended disclosure