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.

Project Subscriptions

Vendors Products
Fourth Frontier Subscribe
Frontier X2 Subscribe
Frontier X Android Application Subscribe
Frontier X Ios Application Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

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:  https://fourthfrontier.com/pages/contact-us Frontier 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.

History

Sat, 30 May 2026 23:00:00 +0000

Type Values Removed Values Added
First Time appeared Fourth Frontier
Fourth Frontier frontier X2
Fourth Frontier frontier X Android Application
Fourth Frontier frontier X Ios Application
Vendors & Products Fourth Frontier
Fourth Frontier frontier X2
Fourth Frontier frontier X Android Application
Fourth Frontier frontier X Ios Application

Fri, 29 May 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 29 May 2026 17:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Fourth Frontier Frontier X Mobile Application, Frontier X2 Missing Authentication for Critical Function
Weaknesses CWE-306
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: icscert

Published:

Updated: 2026-05-29T19:31:52.111Z

Reserved: 2026-04-07T20:28:13.672Z

Link: CVE-2026-5768

cve-icon Vulnrichment

Updated: 2026-05-29T19:31:47.018Z

cve-icon NVD

Status : Received

Published: 2026-05-29T18:17:12.997

Modified: 2026-05-29T18:17:12.997

Link: CVE-2026-5768

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-30T21:18:21Z

Weaknesses