Largest data breaches of 2018
The 1 data breaches first reported in 2018 with the most people affected, using official totals from the filings. Where no official total was filed, the number is the sum of state filings and is labelled "At least". Facts come from official filings with US state attorneys general, the U.S. Department of Health and Human Services (HHS) and the SEC; each breach page links its sources.
| # | Organization | First filed | People affected | Information exposed | Filed with |
|---|---|---|---|---|---|
| 1 | Marriott International, Inc.Marriott International, Inc. breach history | 500,000,000Official total |
|
California AG, Maine AG |
Other years
People affected is the official total from a filing, or “At least” the sum of state filings where no total was filed. Spotted an error? Report a correction.