Millions of hotel guests worldwide have their private details exposed

Sloppy security settings mean another leaky cloud bucket.

A sloppy lack of security by a hotel reservation platform has left highly sensitive information about millions of people worldwide exposed.

Security experts working for Website Planet uncovered a misconfigured AWS S3 bucket containing over 10 million files, containing information about hotel guests dating as far back as 2013.

The finger of blame is pointing at Spanish firm Prestige Software, which sells a platform called Cloud Hospitality that helps hotels manage online booking sites like Expedia,,, and Amadeus.

It’s important to recognise that it was not the hotel booking websites themselves which were responsible for the data breach, or the hotels.

Instead, it was Prestige’s Cloud Hospitality software that was at fault. The software is supposed to ensure that a hotel room reserved on, say, Amadeus, is correctly marked as unavailable on and other sites.

The software is not supposed to then leave the sensitive data, unencrypted and accessible to anyone on the internet – no password required. All because the cloud-based storage was misconfigured.

The 24.4 GB of exposed information left on the Amazon S3 bucket included guests’ full names, email addresses, phone numbers, ID numbers, and reservation numbers. In addition, credit card details (including card numbers, cardholder names, CVVs, and expiration dates).

In the wrong hands that data could easily be exploited by identity thieves and scammers.

Having come across such a significant data breach, Website Planet chose to contact Amazon’s AWS team directly to request that the misconfigured bucket be shut down, and confirmed that the information was no longer accessible the next day.

What isn’t known is quite how long the bucket had been left open by Prestige Software, and if any criminals did access the data or not.

However, seeing as security researchers keep stumbling across leaky cloud-storage buckets containing sensitive data it’s hard to believe that online criminals are not doing the same.

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Graham Cluley is a veteran of the anti-virus industry having worked for a number of security companies since the early 1990s when he wrote the first ever version of Dr Solomon’s Anti-Virus Toolkit for Windows. Now an independent security analyst, he regularly makes media appearances and is an international public speaker on the topic of computer security, hackers, and online privacy.

Follow him on Twitter at @gcluley, or drop him an email.