111M accounts from Pemiblanc (pemiblanc.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesPasswords
In April 2018, a credential stuffing list containing 111 million email addresses and passwords known as Pemiblanc was discovered on a French server. The list contained email addresses and passwords collated from different data breaches and used to mount account takeover attacks against other services. Read more about the incident.
Source: Have I Been Pwned (CC BY 4.0)