458K accounts from WIIU ISO (wiiuiso.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 September 2015, the Nintendo Wii U forum known as WIIU ISO was hacked and 458k accounts were exposed. Along with email and IP addresses, the vBulletin forum also exposed salted MD5 password hashes.
Source: Have I Been Pwned (CC BY 4.0)