Gaming website Gamigo was hacked earlier this year and user data was stolen off their servers.
The company alerted their members asking them to change their passwords.
And months after that hack attack, the leaked data was posted on the web recently.
Security experts have confirmed that the leaked data looks genuine and it contains information on around eight million accounts.
They are advising all the subscribers of Gamigo to change their passwords on third party sites if they used the same username/password combination on them.
This is said to be one of the largest leaks of user data connected to a web based platform.