453K accounts from OVH (ovh.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 mid-2015, the forum for the hosting provider known as OVH suffered a data breach. The vBulletin forum contained 453k accounts including usernames, email and IP addresses and passwords stored as salted MD5 hashes.
Source: Have I Been Pwned (CC BY 4.0)