Cybercriminals hit Qantas in a major data breach that exposed information from up to six million customers. Airline data breaches are on the rise, putting millions of travelers at risk. The Qantas incident underscores how vulnerable personal information can be.

Australia's Qantas Airways said on Wednesday more than a million customers had their phone number, birth date or home address accessed in one of the country's biggest cyber breaches in years.

The cyber incident was discovered on June 30, and is believed to have compromised the data of up to 6 million customers.