Under Armour confirms second major data breach
Under Armour has confirmed a significant data breach investigation in January 2026. The incident began in November 2025 when the Everest ransomware group claimed access to 343GB of internal company data, seemingly going unnoticed for several weeks. By January 2026, approximately 72.7 million unique email addresses were published on a public hacking forum.
The compromised data includes personal information such as customer names, birth dates, genders, locations, and purchase histories. Under Armour states that passwords, payment systems, and the main UA.com website were not affected.
Pattern of security failures
This marks the second major breach for Under Armour. In 2018, the company experienced a breach affecting 150 million MyFitnessPal user accounts. The recurrence of this issue clearly demonstrates that the company has not acted sufficiently to protect customer information.
Legal action and allegations
Following the previous breach, multiple class action lawsuits were filed in the United States, including Ganesh v. Under Armour Inc. in the US District Court for the District of Maryland. Plaintiffs allege negligence in protecting customer and employee information, breach of implied contract, and invasion of privacy. The lawsuits claim that Under Armour failed to provide timely notification and implement adequate cybersecurity safeguards.
Take Out
This second breach reinforces concerns that the company has not implemented sufficient security measures. Surely this undermines its defence in the original case, which was based on its claim that it had taken reasonable precautions. Clearly not.
Last Updated on 3 October 2026 by tfk the5krunner
Small things I always use
- Garmin 90-degree charging adapter: Charges your Garmin from any USB-C cable. Essential when travelling. I use one.
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Watches and sensors
- Polar H10: My daily driver for waking HRV.
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- Nomad bedside charger: Charges my iPhone and Apple Watch overnight. I use it, and many of their bands.
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- Garmin Forerunner 970: A pro-grade triathlon watch. I use this.
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- Garmin Fenix 9 Pro: I’ve just bought one.
On the bike
- Continental GP5000 for everyday riding, and Aero 111 on the front for special occasions.
- Helmets: Specialized S-Works Evade 3 for road riding, and Rudy Project Wing for TT-style races. I use both.
- Ravemen FR300: A front light that mounts under your Garmin or Wahoo. I use one.
- Wahoo TRACKR Radar: I use it on one bike and Varia on the other. They perform the same.
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Home and indoor training
- NPE Runn: Makes my basic treadmill smart, sending more accurate speed and distance to my watch and Zwift. I use it.
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Health, recovery and sleep
- FreeStyle Libre 3 Plus: Shows how my blood sugar responds to diet.
- hDrop: Measures my sweat loss in summer and indoors.
- Fourth Frontier Zone: Checks my heart under load in hard sessions.
- Oura Ring 5: My partner’s recovery tracker of choice.
- Eight Sleep: A cooling mattress cover my partner and I use nightly.
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tfk is the founder and author of the5krunner, an independent endurance sports technology publication. With 20 years of hands-on testing of GPS watches and wearables, and competing in triathlons at an international age-group level, tfk provides in-depth expert analysis of fitness technology for serious athletes and endurance sport competitors. See the gear tfk uses. ID
