---
id: CVE-2026-5768
title: >-
  The Frontier X2 device allows unauthenticated BLE read/write access to
  critical GATT characteristics without enforcing pairing authentication or
  authorization
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 dev…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-306
published: '2026-05-29'
updated: '2026-07-22'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-5768'
references:
  - url: 'https://fourthfrontier.com/pages/contact-us'
    label: ics-cert@hq.dhs.gov
  - url: >-
      https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsma-26-148-01.json
    label: ics-cert@hq.dhs.gov
  - url: 'https://www.cisa.gov/news-events/ics-medical-advisories/icsma-26-148-01'
    label: ics-cert@hq.dhs.gov
tags:
  - nvd
epss: 0.00427
epssPercentile: 0.34239
ingestedAt: '2026-07-22T20:06:05.242Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.