1.3M accounts from Xbox 360 ISO (xbox360iso.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 September 2015, the XBOX 360 forum known as XBOX360 ISO was hacked and 1.2 million 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)