The data leak stems from sales engagement startup Apollo, which left a database containing billions of data points publicly exposed without a password in July 2018, stated the site.
The data left exposed by Apollo was used in their "revenue acceleration platform" and included information such as names and email addresses – as well as professional information including places of employment, the roles people hold, and where they are located, said Have I Been Pwned.
"Apollo stressed that the exposed data did not include sensitive information such as passwords, social security numbers, or financial data."
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