4.01M accounts from Club Penguin Rewritten (July 2019) (cprewritten.net) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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In July 2019, the children's gaming site Club Penguin Rewritten (CPRewritten) suffered a data breach (note: CPRewritten is an independent recreation of Disney's Club Penguin game). In addition to an earlier data breach that impacted 1.7 million accounts, the subsequent breach exposed 4 million unique email addresses alongside IP addresses, usernames and passwords stored as bcrypt hashes.
Source: Have I Been Pwned (CC BY 4.0)