CVE-2026-5768 Fourth Frontier Frontier X Mobile Application, Frontier X2 Missing Authentication for Critical Function
Attackers within Bluetooth range can access critical device functions and inject fake health data due to missing authentication in the Frontier X2 wearable and mobile app.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-5768?
CVE-2026-5768 is a high-severity missing authorization vulnerability in Fourth Frontier Frontier X Android application, published on 29 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
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.
Weakness: CWE-306
Which versions are affected by CVE-2026-5768?
How do I fix CVE-2026-5768?
No fix has been published for CVE-2026-5768 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-5768 being exploited?
There is no known exploitation of CVE-2026-5768 in the wild and no public exploit code.
Sources
Also known as GHSA-frhh-w545-jjh2.