Millions of Australians have been cautioned not to fall for bogus Qantas compensation claims after having their personal information leaked online.

The flying kangaroo was one of six global companies to have their data released at the weekend after hackers from Scattered LAPSUS$ Hunters made good on a ransom threat.

The leak stemmed from up to 5.7 million of Qantas' customers having their data compromised in one of its offshore call centres that used Salesforce software.

Details included full names, email addresses and Frequent Flyer details, as well as business and home addresses, dates of birth, phone numbers, gender and, in fewer cases, meal preferences.

The data could potentially be used for identity theft attacks as it gave hackers more points of verification, said cybersecurity e

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