Ticketing agency Ticketmaster has been caught up in a suspected data breach potentially exposing thousands of customers' private details to hackers.

The company, one of the world's largest ticket sellers, emailed customers on Thursday morning to inform them their personal data may have been compromised.

Australians who purchased tickets via Ticketmaster between September 2017 and June this year have been warned about malicious software that targeted a third-party customer support product.