Several apps on the iOS App Store have been found to be using private APIs to collect device and user data thanks to a third-party advertising SDK. Apps that utilize the Youmi SDK have been found to be collecting data on a device's installed apps, the platform serial number, peripheral serial numbers, and the user's Apple ID. It looks like 256 apps were found to be doing this, though according to SourceDNA, who spotted the issue, they likely didn't know what was happening.
Apple later confirmed the issue, offering the following statement:
You can read the full report at the link below.
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Joseph Keller is the former Editor in Chief of iMore. An Apple user for almost 20 years, he spends his time learning the ins and outs of iOS and macOS, always finding ways of getting the most out of his iPhone, iPad, Apple Watch, and Mac.