Hackers have released data of up to 5.7 million Qantas customers' data on the dark web after following through on a ransom threat.

The hacker posted an extortion notice online threatening to release the data if a ransom payment was not made, and they followed through on the morning of October 12.

The data obtained included customers' names, frequent flyer numbers, email addresses, in some cases home addresses, phone numbers, genders, and birthdays.

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