Qantas Airways confirmed customer data stolen in a July breach had been published by cybercriminals.

The airline said in July that more than a million customers had sensitive details such as phone numbers, birth dates or home addresses accessed in one of Australia's biggest cyber breaches in years.

Another four million customers had just their name and email address taken during the hack, it said at the time.

The July breach represented Australia's most high-profile cyberattack since telecommunications giant Optus and health insurer Medibank were hit in 2022, incidents that prompted mandatory cyber resilience laws.

On Sunday, Qantas said in a statement that it was "one of a number of companies globally that has had data released by cyber criminals following the airline’s cyber incident

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