Vulnerability · Published May 29, 2026 · Assigned by icscert
CVE-2026-5768Fourth Frontier Frontier X Mobile Application, Frontier X2 Missing Authentication for Critical Function
High 8.8
In plain English
A high-severity missing authentication in Frontier X Android application from Fourth Frontier. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Fourth Frontier | Frontier X Android application | 0 – before 15.0.0 |
| Fourth Frontier | Frontier X IOS application | 0 – before 25.0.0 |
| Fourth Frontier | Frontier X2 | All versions |
Weakness: CWE-306 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H