120K accounts from MCBans (mcbans.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 addressesPasswordsUsernamesWebsite activity
In October 2016, the Minecraft banning service known as MCBans suffered a data breach resulting in the exposure of 120k unique user records. The data contained email and IP addresses, usernames and password hashes of unknown format. The site was previously reported as compromised on the Vigilante.pw breached database directory.
Source: Have I Been Pwned (CC BY 4.0)