3.83M accounts from Bookmate (bookmate.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Dates of birthEmail addressesGendersGeographic locationsNamesPasswordsUsernames
In mid-2018, the social ebook subscription service Bookmate was among a raft of sites that were breached and their data then sold in early-2019. The data included almost 4 million unique email addresses alongside names, genders, dates of birth and passwords stored as salted SHA-512 hashes.
Source: Have I Been Pwned (CC BY 4.0)