The popular Android browser UC Browser was found to break several Google mobile app rules possibly placing up to 500 million of its users at risk.

UC Browser, which is available from the Google Play store, was found by Zscaler ThreatLabZ team to be making some highly questionable moves once downloaded, many of which go against Google’s stated app policies. It has more than 500 million downloads.

The Google rules broken include altering the app, which is done when a third-party Android Package Kit is dropped onto the device, communicating over an unsecured channel and dropping an APK into external storage.

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