41.8M accounts from Kayo.moe Credential Stuffing List 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 September 2018, a collection of almost 42 million email address and plain text password pairs was uploaded to the anonymous file sharing service kayo.moe. The operator of the service contacted HIBP to report the data which, upon further investigation, turned out to be a large credential stuffing list. For more information, read about The 42M Record kayo.moe Credential Stuffing Data.
Source: Have I Been Pwned (CC BY 4.0)