CVE-2026-5768 (GCVE-0-2026-5768)
Vulnerability from cvelistv5 – Published: 2026-05-29 16:58 – Updated: 2026-05-29 16:58
VLAI
Title
Fourth Frontier Frontier X Mobile Application, Frontier X2 Missing Authentication for Critical Function
Summary
The Frontier X2 device allows unauthenticated BLE read/write access to critical GATT characteristics without enforcing pairing authentication or authorization. This allows attackers within BLE range to perform unauthorized control of device functions, including starting/stopping activities, triggering vibrations, causing denial-of-service conditions, and fuzzing characteristic values to induce unexpected behavior. Additionally, the Frontier X mobile application lacks proper BLE device authentication, allowing attackers to impersonate a legitimate Frontier X2 device and connect to the application. By cloning BLE advertisements and exposing expected GATT characteristics, attackers can manipulate activity states and inject fabricated health telemetry such as breathing rate, heart rate, strain, and other health-related data into the mobile application.
Severity
8.8 (High)
CWE
Assigner
References
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| Fourth Frontier | Frontier X Android application |
Affected:
0 , < 15.0.0
(custom)
|
|
| Fourth Frontier | Frontier X IOS application |
Affected:
0 , < 25.0.0
(custom)
|
|
| Fourth Frontier | Frontier X2 |
Affected:
All versions
|
Date Public
2026-05-28 16:46
Credits
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"value": "The Frontier X2 device allows unauthenticated BLE read/write access to critical GATT characteristics without enforcing pairing authentication or authorization. This allows attackers within BLE range to perform unauthorized control of device functions, including starting/stopping activities, triggering vibrations, causing denial-of-service conditions, and fuzzing characteristic values to induce unexpected behavior. Additionally, the Frontier X mobile application lacks proper BLE device authentication, allowing attackers to impersonate a legitimate Frontier X2 device and connect to the application. By cloning BLE advertisements and exposing expected GATT characteristics, attackers can manipulate activity states and inject fabricated health telemetry such as breathing rate, heart rate, strain, and other health-related data into the mobile application."
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"url": "https://fourthfrontier.com/pages/contact-us"
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"title": "Fourth Frontier Frontier X Mobile Application, Frontier X2 Missing Authentication for Critical Function",
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"value": "Fourth Frontier is aware of the vulnerability and is working on a fix. Users are encouraged to reach out to Fourth Frontier directly for assistance:\u00a0\n https://fourthfrontier.com/pages/contact-us \n\n\n\nFrontier X/X2 devices can connect to only one app at a time; users should first connect the Frontier X/X2 device using the Frontier X app and then start the activity."
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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