Researcher finds that the Apple AirTag can be hacked and reprogrammed to cause mischief
A German researcher by the name of stacksmashing disseminated a tweet about his success hacking the Apple AirTag item tracker. He reversed-engineered the microcontroller on the device (although he bricked two AppleTag units while attempting to do this) and re-flashed the microcontroller allowing him to make some changes to the AirTag's functionality. The change made had to do with the URL that appears on a notification when an AirTag in Lost Mode is tapped by an NFC-enabled smartphone (iOS or Android).
When an AirTag is placed in Lost Mode, it sends out signals that can be picked up by the close to 1 billion active Apple devices world wide. When an AirTag is discovered by this "Find My" network," placing the AirTag close to an iPhone or an NFC-enabled Android device will open a notification redirecting the person finding the lost tag to a website (found.apple.com). Hopefully the owner of the missing object remembered to add his contact information including a phone number and a message.