In a significant cybersecurity incident, the personal and credit card data of more than half a billion Ticketmaster users have been compromised, according to a report Wednesday.

Authorities in Australia are collaborating with Ticketmaster and its parent, Live Nation, to investigate the breach.

The Department of Home Affairs in Australia confirmed to ABC News that it’s working with Ticketmaster to understand the scope and impact of the incident. However, neither Ticketmaster nor its parent company has issued an official statement regarding the breach.

According to claims by the hacker group ShinyHunters, they have accessed 1.3 terabytes of data from Ticketmaster. This trove of information includes names, addresses, credit card numbers, phone numbers and other payment details. Reports indicate that the data is being sold on the dark web for $500,000.

Early investigations suggest that the breach affects 560 million customers globally. It’s unclear which markets are most affected.

The compromised data poses a significant risk of identity fraud and could be used for phishing or impersonation attacks, according to cybersecurity expert Mark Lukie. “Users need to be very vigilant about their email and who they’re responding to and not giving out any information to people trying to trick them,” he advised in the ABC report.

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