447K accounts from PS3Hax (ps3hax.net) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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In approximately July 2015, the Sony Playstation hacks and mods forum known as PS3Hax was hacked and more than 447k accounts were exposed. The vBulletin forum included IP addresses and passwords stored as salted hashes using a weak implementation enabling many to be rapidly cracked.
Source: Have I Been Pwned (CC BY 4.0)