777K accounts from ForumCommunity (forumcommunity.net) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesPasswordsUsernames
In approximately mid-2016, the Italian-based service for creating forums known as ForumCommunity suffered a data breach. The incident impacted over 776k unique email addresses along with usernames and unsalted MD5 password hashes. No response was received from ForumCommunity when contacted.
Source: Have I Been Pwned (CC BY 4.0)