1.69M accounts from Club Penguin Rewritten (January 2018) (cprewritten.net) 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 January 2018, 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). The incident exposed almost 1.7 million unique email addresses alongside IP addresses, usernames and passwords stored as bcrypt hashes. When contacted, CPRewritten advised they were aware of the breach and had "contacted affected users".
Source: Have I Been Pwned (CC BY 4.0)