A data breach at flight booking site Option Way exposed personal details on passengers and their flight and travel plans.

Researchers at vpnMentor led by Noam Rotem and Ran Locar were “able to access over 100 GB of data, a massive amount of customers’ unencrypted Personally Identifiable Information (PII),” including names, birth dates, gender email addresses, destinations, flight prices and flight departure and return dates.

User emails were accessible through “‘incorrect password’ reset links,” which exposed exposed the wide database to potential hacks, and Option Way users to a lot of potential fraud,” the researchers wrote in a blog post.

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