1.27M accounts from PSP ISO (pspiso.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 PlayStation PSP forum known as PSP ISO was hacked and almost 1.3 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)