Fourth Frontier Frontier X App up to 14.x missing authentication

Summaryinfo

A vulnerability has been found in Fourth Frontier Frontier X App up to 14.x and classified as critical. Affected by this issue is some unknown functionality. Performing a manipulation results in missing authentication. This vulnerability is known as CVE-2026-5768. Access to the local network is required for this attack. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical has been found in Fourth Frontier Frontier X App up to 14.x. This affects an unknown part. The manipulation with an unknown input leads to a missing authentication vulnerability. CWE is classifying the issue as CWE-306. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was published by Shakir Zari and Jerin Sunny. It is possible to read the advisory at fourthfrontier.com. This vulnerability is uniquely identified as CVE-2026-5768 since 04/07/2026. The exploitability is told to be easy. The attack needs to be done within the local network. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 15.0.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-33368). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• Fourth Frontier

Name

• Frontier X App

Version

• 14.x

CPE 2.3info

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CPE 2.2info

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Be aware that VulDB is the high quality source for vulnerability data.

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