AirTag Successfully Hacked to Show Custom URL in Lost Mode

The inevitable race to hack Apple's AirTag item tracker has reportedly been won by a German security researcher, who managed to break into the device's microcontroller and successfully modify its firmware.


Thomas Roth, aka Stack Smashing, shared his achievement in a tweet and explained that re-flashing the device's microcontroller had enabled him to change the URL for Lost Mode, so that it opens his personal website on a nearby iPhone or other NFC-enabled device instead of directly linking to an official Find My web address.

Managing to break into the microcontroller is a crucial hurdle to overcome to if the aim is to further manipulate the device's hardware. As The 8-Bit notes:

A microcontroller is an integrated circuit (IC) used for controlling devices usually via a microprocessing unit, memory, and other peripherals. According to AllAboutCircuits, "these devices are optimized for embedded applications that require both processing functionality and agile, responsive interaction with digital, analog, or electromechanical components."

Roth also shared a video comparing a normal ‌AirTag‌ to his modified device.


How the hack might be exploited in the wild is unclear at this time, but the fact that it can be done may open up avenues for the jailbreaking community to customize the device in ways Apple didn't intend. On a darker note, it could also present opportunities for bad actors to modify the ‌AirTag‌ software for the purposes of phishing and more.

That's assuming Apple isn't able to remotely block such a modified ‌AirTag‌ from communicating with the ‌Find My‌ network. Alternately, Apple might be able to lock down the firmware in a future ‌AirTag‌ software update. Watch this space.

Popular Stories

iOS 26

When Will Apple Release iOS 26.2?

Monday December 1, 2025 4:37 pm PST by
We're getting closer to the launch of the final major iOS update of the year, with Apple set to release iOS 26.2 in December. We've had three betas so far and are expecting a fourth beta or a release candidate this week, so a launch could follow as soon as next week. Past Launch Dates Apple's past iOS x.2 updates from the last few years have all happened right around the middle of the...
ios 18 to ios 26 upgrade

Apple Pushes iPhone Users Still on iOS 18 to Upgrade to iOS 26

Tuesday December 2, 2025 11:09 am PST by
Apple is encouraging iPhone users who are still running iOS 18 to upgrade to iOS 26 by making the iOS 26 software upgrade option more prominent. Since iOS 26 launched in September, it has been displayed as an optional upgrade at the bottom of the Software Update interface in the Settings app. iOS 18 has been the default operating system option, and users running iOS 18 have seen iOS 18...
maxresdefault

iPhone Fold: Launch, Pricing, and What to Expect From Apple's Foldable

Monday December 1, 2025 3:00 am PST by
Apple is expected to launch a new foldable iPhone next year, based on multiple rumors and credible sources. The long-awaited device has been rumored for years now, but signs increasingly suggest that 2026 could indeed be the year that Apple releases its first foldable device. Subscribe to the MacRumors YouTube channel for more videos. Below, we've collated an updated set of key details that ...
iOS 26

Apple Seeds iOS 26.2 and iPadOS 26.2 Release Candidates to Developers and Public Beta Testers

Wednesday December 3, 2025 10:33 am PST by
Apple today seeded the release candidate versions of upcoming iOS 26.2 and iPadOS 26.2 updates to developers and public beta testers, with the software coming two weeks after Apple seeded the third betas. The release candidates represent the final versions of iOS 26.2 and iPadOS 26.2 that will be provided to the public if no further bugs are found during this final week of testing....
Photos App Icon Liquid Glass

John Gruber Shares Scathing Commentary About Apple's Departing Software Design Chief

Thursday December 4, 2025 9:30 am PST by
In a statement shared with Bloomberg on Wednesday, Apple confirmed that its software design chief Alan Dye will be leaving. Apple said Dye will be succeeded by Stephen Lemay, who has been a software designer at the company since 1999. Meta CEO Mark Zuckerberg announced that Dye will lead a new creative studio within the company's AR/VR division Reality Labs. On his blog Daring Fireball,...
iphone 17 cyber

iPhone 17 Demand Is Breaking Apple's Sales Records

Tuesday December 2, 2025 9:44 am PST by
Apple's iPhone 17 lineup is selling well enough that Apple is on track to ship more than 247.4 million total iPhones in 2025, according to a new report from IDC. Total 2025 shipments are forecast to grow 6.1 percent year over year due to iPhone 17 demand and increased sales in China, a major market for Apple. Overall worldwide smartphone shipments across Android and iOS are forecast to...
Touchscreen MacBook Feature

Here Are the Four MacBooks Apple Is Expected to Launch Next Year

Monday December 1, 2025 5:00 am PST by
2026 could be a bumper year for Apple's Mac lineup, with the company expected to announce as many as four separate MacBook launches. Rumors suggest Apple will court both ends of the consumer spectrum, with more affordable options for students and feature-rich premium lines for users that seek the highest specifications from a laptop. Below is a breakdown of what we're expecting over the next ...
iphone air camera

iPhone Air's Resale Value Has Dropped Dramatically, Data Shows

Thursday December 4, 2025 5:27 am PST by
The iPhone Air has recorded the steepest early resale value drop of any iPhone model in years, with new data showing that several configurations have lost almost 50% of their value within ten weeks of launch. According to a ten-week analysis published by SellCell, Apple's latest lineup is showing a pronounced split in resale performance between the iPhone 17 models and the iPhone Air....
iPhone 17 Pro Cosmic Orange

iPhone 17 Pro Lost a Camera Feature Pro Models Have Had Since 2020

Thursday December 4, 2025 5:18 am PST by
iPhone 17 Pro models, it turns out, can't take photos in Night mode when Portrait mode is selected in the Camera app – a capability that's been available on Apple's Pro devices since the iPhone 12 Pro in 2020. If you're an iPhone 17 Pro or iPhone 17 Pro Max owner, try it for yourself: Open the Camera app with Photo selected in the carousel, then cover the rear lenses with your hand to...
iPhone 17 Pro Cosmic Orange

10 Reasons to Wait for Next Year's iPhone 18 Pro

Monday December 1, 2025 2:40 am PST by
Apple's iPhone development roadmap runs several years into the future and the company is continually working with suppliers on several successive iPhone models at the same time, which is why we often get rumored features months ahead of launch. The iPhone 18 series is no different, and we already have a good idea of what to expect for the iPhone 18 Pro and iPhone 18 Pro Max. One thing worth...

Top Rated Comments

krewger Avatar
60 months ago
So…. It’s been hacked to be a customizable nfc tag. Looks like a lot of trouble to go through. I could also just put new nfc tags inside the AirTag’s case and accomplish the same thing. Security on your personal device is already in place - the link is displayed on the phone asking if you want to open it first before visiting the URL. https://electronics.howstuffworks.com/nfc-tag.htm
Score: 21 Votes (Like | Disagree)
Puonti Avatar
60 months ago

The AirTag does not carry other data than its own position.
I don't believe this is accurate. As I understand it:

An AirTag does not know where it is. All it does for location tracking is transmit radio waves. Devices that do know where they are can detect the AirTag, and then tell the FindMy network "I am at this location, and hey there's an AirTag here".
Score: 18 Votes (Like | Disagree)
Jumpinbeans Avatar
60 months ago
Basically if you find an airtag and don't know why its there or who it belongs to and its not worth scanning as it may be compromised - smash it :)
Score: 17 Votes (Like | Disagree)
szw-mapple fan Avatar
60 months ago

So if you lose your AirTag and then find it after one day for example, you cannot trust it anymore? Or if you find someones AirTag should you be also wary of placing it near your own phone? This gets interesting.
This won't apply to the vast vast majority of users. It's a security exercise that's just to prove it's possible. People who needs to be worried about this type of exploits won't be using any trackers of this type anyways.
Score: 14 Votes (Like | Disagree)
Unregistered 4U Avatar
60 months ago
Next up from security researchers
“SWALLOWING AIRTAGS COULD COMPROMISE YOUR DIGESTIVE SYSTEM… WHAT YOU NEED TO KNOW”
or
“if you glue your house key to your airtag and then lose it, AIRTAGS COULD ALLOW SOMEONE ENTRY INTO YOUR HOUSE!”
Score: 11 Votes (Like | Disagree)
tomekwsrod Avatar
60 months ago
So if you lose your AirTag and then find it after one day for example, you cannot trust it anymore? Or if you find someones AirTag should you be also wary of placing it near your own phone? This gets interesting.
Score: 9 Votes (Like | Disagree)