62.3K accounts from Planet Calypso (planetcalypsoforum.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesIP addressesPasswordsUsernames
In approximately July 2019, the forums for the Planet Calypso game suffered a data breach. The breach of the vBulletin based forum exposed email and IP addresses, usernames and passwords stored as salted MD5 hashes.
Source: Have I Been Pwned (CC BY 4.0)