All-time biggest online data breaches 2024

Most significant cases of data breach worldwide as of January 2024 (in millions), by number of compromised data records and individuals impacted

CharacteristicNumber of impacted users and breached records
Cam4 Data Breach (Mar 2020) 10.88bn records
Yahoo Data Breach (2017)* 3bn acounts
National Public Data Breach (Apr 2024) 2.9bn records
Aadhaar Data Breach (Mar 2018) 1.1bn people
Alibaba Data Breach (Jul 2022) 1.1bn users
First American Financial Corporation Data Breach (May 2019) 885m users
Verifications.io Data Breach (Feb 2019) 763m users
LinkedIn Data Breach (Jun 2021) 700m users
Facebook Data Breach (Apr 2019) 533m users
Yahoo Data Breach (2014) 500m accounts
Starwood (Marriott) Data Breach (Nov 2018) 500m guests
Adult Friend Finder Data Breach (Oct 2016) 412.2m accounts
MySpace Data Breach (Jun 2013) 360m accounts
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Release date

August 2024

Region

Worldwide

Survey time period

January 2024

Special properties

based on number of records lost

Supplementary notes

  • Yahoo Data Breach occurred in 2013 but only disclosed in 2017. The number of records stolen was originally thought to be much smaller. Yahoo revealed the real numbers in December 2019 after the investigation.
  • Data on National Pubic Data Breach is from Bloomberg.

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Overview

4

Cyberattacks

7

Data breaches

8

Impacted industries

8

Financial impact

4

Security measures and prevention

8

Further related statistics

18

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