995K accounts from Bolt (bolt.cd) 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 March 2017, the file sharing website Bolt suffered a data breach resulting in the exposure of 995k unique user records. The data was sourced from their vBulletin forum and contained email and IP addresses, usernames and salted MD5 password hashes. The site was previously reported as compromised on the Vigilante.pw breached database directory.
Source: Have I Been Pwned (CC BY 4.0)