505K accounts from Kimsufi (kimsufi.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
Was your email address in this breach?
We display where your address leaked and what went with it. We never store the address.
We don't store your address. It is checked right here against about 1029 breaches, including this one.
Email addressesIP addressesPasswordsUsernames
In mid-2015, the forum for the providers of affordable dedicated servers known as Kimsufi suffered a data breach. The vBulletin forum contained over half a million accounts including usernames, email and IP addresses and passwords stored as salted MD5 hashes.
Source: Have I Been Pwned (CC BY 4.0)