A vulnerability in numerous airline e-ticketing systems can expose customer data via unencrypted check-in links that hackers can easily intercept, researchers at Wandera said.

“The intercepted and unencrypted links enable unauthorized third parties to view, and in some cases even change, a user’s flight booking details, and/or print their boarding passes,” the researchers, who discovered the vulnerability in December, wrote in a blog post.

Airlines affected at the time of the discovery included Southwest, Air France, KLM, Vueling, Jetstar, Thomas Cook, Transavia and Air Europa. 

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