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

Apple Shopping Event 2025

Apple Announces 2025 Black Friday Event, Here's What You Can Get

Thursday November 20, 2025 6:28 am PST by
Apple's annual four-day Black Friday through Cyber Monday shopping event is returning on Friday, November 28 through Monday, December 1 in many countries, including the United States, Canada, Australia, New Zealand, France, Germany, Italy, Spain, the United Kingdom, Belgium, the Netherlands, Sweden, Thailand, and others. During the shopping event, customers can get an Apple gift card with...
iPhone 17 Pro Cosmic Orange

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

Wednesday November 19, 2025 4:00 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...
iOS 26

Everything New in iOS 26.2 Beta 3

Monday November 17, 2025 3:20 pm PST by
Apple provided developers with the third beta of an upcoming iOS 26.2 update, and there are still new features that are being added with each beta that we get. We've rounded up all of the changes that Apple made in beta 3. AirDrop Apple added new AirDrop functionality, providing a way for two people to share files temporarily without having to add one another as contacts. iOS 26.2...
applecare apple care banner

Apple Brings New AppleCare+ Options to India

Tuesday November 18, 2025 8:42 am PST by
Apple today announced an expansion of AppleCare+ coverage in India, with new options for monthly and annual plans, and the addition of Theft and Loss for iPhone for the first time. Options for monthly and annual AppleCare+ plans in India provide more choice and flexibility, allowing users to keep coverage for as long as they require. Apple's vice president of Worldwide iPhone Product...
ipad mini 7 feature red and blue

iPad Mini 8: Four Major New Features to Expect

Wednesday November 19, 2025 7:50 am PST by
Apple's eighth-generation iPad mini is highly likely to arrive next year, offering a significant refresh of the device with at least four major new features. OLED Display The next-generation version of the iPad mini could feature an OLED display, as part of Apple's plan to expand the display technology across many more of its devices. Apple's first OLED device was the Apple Watch in 2015, ...
iOS 26

iOS 26.2 Adds These New Features to Your iPhone

Thursday November 20, 2025 10:50 am PST by
iOS 26.2 is currently in beta testing. The upcoming update includes a handful of new features and changes on the iPhone, including a new Liquid Glass slider for the Lock Screen's clock, offline lyrics for Apple Music, and more. In a recent press release, Apple confirmed that iOS 26.2 will be released to all users in December, but it did not provide a specific release date. Keep reading...
iPhone 17 Pro and Air N1 Feature

iPhone 17 vs. iPhone 16 Wi-Fi Speeds: New Study Reveals the Winner

Tuesday November 18, 2025 10:53 am PST by
A new study has revealed that the iPhone 17, iPhone 17 Pro, iPhone 17 Pro Max, and iPhone Air achieve significantly faster average Wi-Fi speeds compared to the iPhone 16 series, thanks to Apple's custom-designed N1 chip. The study was conducted by Ookla, the company behind the popular Speedtest website and app. It said the results are based on global, crowdsourced Speedtest user data...
Apple Wallet ID Illinois

iPhone Driver's License Feature Launching in Illinois

Tuesday November 18, 2025 8:47 am PST by
In select U.S. states, residents can add their driver's license or state ID to the Wallet app on the iPhone and Apple Watch, providing a convenient and contactless way to display proof of identity or age at select airports and businesses, and in select apps. Starting this Wednesday, November 19, the feature will be available to residents of Illinois. The announcement confirmed that the...
macbook black friday

The Best Early Black Friday Mac Deals

Tuesday November 18, 2025 7:32 am PST by
We're getting closer to Black Friday, which lands next week on Friday, November 28. In the lead-up to the shopping holiday, we're tracking a few lowest-ever prices on Apple's most popular Macs, including the M4 MacBook Air and brand new M5 MacBook Pro. Note: MacRumors is an affiliate partner with some of these vendors. When you click a link and make a purchase, we may receive a small payment,...
hikawa phone grip stand apple%402x

Apple Launches Second Limited-Edition iPhone Accessory in a Month

Friday November 21, 2025 3:53 am PST by
Apple has begun selling the Hikawa Phone Grip and Stand, a new limited-edition iPhone accessory designed with accessibility in mind. Designed by LA-based Bailey Hikawa to celebrate the 40th anniversary of accessibility at Apple, the grip uses magnets to securely snap onto any iPhone with MagSafe. Apple says it can be removed with ease, and doubles as a stand with two different viewing...

Top Rated Comments

krewger Avatar
59 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
59 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
59 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
59 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
59 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
59 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)