The Kromtech Security Center, part of MacKeeper, has found that the details of more than 31 million users of an add-on smartphone keyboard have been leaked online.

According to the firm, the MongoDB database used to collect data on Ai.type keyboard users was misconfigured, leaving the "data and details” of millions of people publicly available online.

MongoDB is a common platform used by companies to store data. However, a simple misconfiguration could mean that the database is then exposed online. A significant flaw is that the default settings of a MongoDB database allow anyone with an internet connection to browse the databases, download them, or even – in the worst cases – delete the data stored on them.

The app is available from both the Apple App Store and the Google Play Store.

Bob Diachenko, chief communications officer at the Kromtech Security Center, wrote in a blog post: “Consumers give up more data than ever before in exchange for using services or applications. The scary part is that companies collect and use their personal data in ways they may not know.”

He also questioned why a “keyboard and emoji application” would need to gather all the data of the user’s phone or tablet. Mr Diachenko revealed that based on the leaked database, the app collected “everything from contacts to keystrokes”.

According to the Kromtech Security Center, this leak has exposed exactly how much data the app accessed and how the firm behind it obtained “a treasure trove” of data that the average user would not expect to be extracted from their device.

The data accessed includes – but is not limited to – phone numbers, users’ full names, device names and models, location details, screen resolutions, user languages enabled, IMEI number (a unique number given to every single mobile phone), emails associated with the phone and country of residence.

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