77.2M accounts from Nitro (gonitro.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesNamesPasswords
In September 2020, the Nitro PDF service suffered a massive data breach which exposed over 70 million unique email addresses. The breach also exposed names, bcrypt password hashes and the titles of converted documents. The data was provided to HIBP by dehashed.com.
Source: Have I Been Pwned (CC BY 4.0)