The cyberattack targeting the personal data of customers with Qantas is the latest in a string of breaches affecting millions of Australians, as hackers target major companies and exploit weak spots in the systems they rely on.

Qantas is warning a "significant" amount of customer data has likely been stolen from its records during a cyber attack against the airline on Monday.

A cyber attack was the furtherest thing from Vanessa Hudson’s mind, as she enjoyed her annual leave far away from the New South Wales’ “bomb cyclone” for the heatwave of Europe.