It’s normal to want to share photos of your travel adventures online, but think twice before uploading a picture of your boarding pass.

Steve Hui, an air travel safety specialist, says he sees hundreds of photos of boarding passes online every day, but most people don’t realize that uploading these photos can ruin their vacations.

The information on your boarding pass can provide access to other confidential information, and it can allow someone else to cancel your booking. Steve Hui decided to demonstrate how easy it can be to access a stranger’s information by using a photo of a boarding pass.

The traveler who posted the photo was flying on Delta Airlines, so Hui headed to the “Manage My Booking” section of Delta’s website. All the site required was the passenger’s name and the booking reference or ticket number, which was printed right on the boarding pass.

Using this information, Hui was able to see all of the passenger’s details, including their travel itinerary, frequent flyer details, and the last four digits of their credit card number.

The barcodes on boarding passes can also reveal plenty of information about a traveler. It’s easy to use an online barcode reader to find a traveler’s full name, flight number, ticket number, and frequent flyer information.

If a stranger uses a photo of your boarding pass to find this information, they could steal your identity or take control of your frequent flyer account.

It’s fun to upload photos to update your family and friends on your trip, but you should always make sure you don’t accidentally share personal details.

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