Australian airline Qantas announced on Sunday that data of more than 5.7 million of its customers, stolen in a major cyberattack earlier this year, has been published online as part of leaks reported to have affected dozens of companies.

In July, Qantas revealed that hackers targeted a customer service center and breached a third-party computer system, gaining access to sensitive information such as customer names, email addresses, phone numbers, and birth dates. The airline emphasized that credit card details and passport numbers were not stored in the system.

According to information from Agence France-Presse, the third party involved is software company Salesforce, which last week acknowledged being aware of recent extortion attempts by threatening entities.

The hackers also obtained stolen data from dozens of other companies including Disney, Google, IKEA, Toyota, McDonald’s, and airlines Air France and KLM.

Qantas stated it is one of several companies worldwide whose data was published by cybercriminals following the July incident when customer data was stolen via a third-party platform.

The airline is investigating the nature of the published data with the help of cybersecurity experts.

Qantas also obtained a court order from the Supreme Court of New South Wales, where its headquarters are located, to prevent access, viewing, publishing, use, or transfer of the stolen data by anyone, including third parties.

Cybersecurity experts linked the hack to individuals associated with an internet crime syndicate called “Scattered Lapsus$ Hunters.” Research group Unit 42 noted that Scattered Lapsus$ Hunters claimed responsibility for stealing data and holding it for ransom, setting a deadline of October 10 for payment.