“We can confirm that a limited amount of non-material company information was accessed in connection with a third-party data breach,” a Rockstar spokesperson told the outlet, external.
The BBC has approached Rockstar for comment, and has spoken to the hackers responsible for this latest breach, who called themselves ShinyHunters.
They are a prolific group of English-speaking cybercriminals, thought to be in their teens, who specialise in data theft and extortion.
They previously claimed to be behind a hack targeting gig ticket operator Ticketmaster.
The criminals did not tell the BBC how they carried out the Rockstar hack, but confirmed stolen data would be published online as their demands had not been met.
Law enforcement advice around the world is not to pay cybercriminal ransoms as it fuels the industry and there is no guarantee hackers will actually delete stolen data.