Researcher shows how popular app ES File Explorer exposes Android device data

Why is one of the most popular Android apps running a hidden web server in the background? ES File Explorer claims it has over 500 million downloads under its belt since 2014, making it one of the most used apps to date. It’s simplicity makes it what it is: a simple file explorer that lets you browse through your Android phone or tablet’s file system for files, data, documents and more. But behind the scenes, the app is running a slimmed-down web server on the device.

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