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DATE : JUNE 2021 NUMBER OF RECORDS COMPROMISED : 700M

June 2021 , a hacker known as “ TomLiner ” advertised the sale of information from around 700 million LinkedIn users on a darknet forum . At the time , this figure represented roughly 90 % of the company ’ s total user base , which made it the largest LinkedIn data breach to date .

The same individual was also responsible for the leak of 500 million LinkedIn records in April 2021 . Such a large-scale data leak was caused by the misuse of LinkedIn ’ s API which enabled the unauthorised data collection . Speaking at the time , LinkedIn confirmed that the scraped data included email addresses , full names , phone numbers and physical addresses . 42 August 2024