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Ticketing giant Ticketmaster has confirmed it was part of a data breach, potentially affecting hundreds of millions of customers around the world.
In filing with the US Securities and Exchange Commission, Ticketmaster's parent company, Live Nation Entertainment, said it had "identified unauthorised activity within a third-party cloud database environment."
The company said it first identified "unauthorised activity" on May 20, a week before notorious hacking group ShinyHunters posted about the breach on a dark web forum.
"We are working to mitigate risk to our users and the company, and have notified and are cooperating with law enforcement," it said.
Ticketmaster added that the incident "has not had, and we do not believe it is reasonably likely to have, a material impact on our overall business operations or on our financial condition or results of operations."
On Wednesday it was reported that the personal details of 560 million Ticketmaster customers may have been leaked in a data breach claimed by ShinyHunters.
The Department of Home Affairs then confirmed with the ABC it was investigating a "cyber incident involving Ticketmaster".
This is the first time Ticketmaster has commented publicly on the breach.
ShinyHunters, a well-known hacking group posted evidence on May 27 of the hack on the dark web, according to a screenshot shared widely on social media.
The group demanded a ransom payment of $US500,000 ($750,000) describing it as a "one-time sale," according to the post.
Ticketmaster, a California-based company, operates one of the largest online ticket sales platforms in the world.
On Friday, rival company Ticketek Australia said the names of some of its customers, as well as their dates of birth and email addresses, may have been accessed in a data breach too.
The company said it had secure encryption methods in place for customer passwords, and no customer accounts or payment details had been compromised in the "cyber incident".
There is no evidence the two potential incidents are related.
ABC/AFP