Hacker breaches security firm in act of revenge

A hacker claims to have breached the backend servers belonging to a US cyber-security firm and stolen information from the company's "data leak detection" service.

The hacker says the stolen data includes more than 8,200 databases containing the information of billions of users that leaked from other companies during past security breaches.

The databases have been collected inside DataViper, a data leak monitoring service managed by Vinny Troia, the security researcher behind Night Lion Security, a US-based cyber-security firm. A data leak monitoring service is a common type of service offered by cyber-security firms. Security companies scan the dark web, hacking forums, paste sites, and other locations to collect information about companies that had their data leaked online.