Fourth Frontier Frontier X Mobile Application, Frontier X2 Missing Authentication for Critical Function

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Summary

CVECVE-2026-5768
StatePUBLISHED
Assignericscert
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-29 18:17:12 UTC
Updated2026-06-16 16:03:27 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.002800000 probability, percentile 0.195840000 (date 2026-06-23)

Problem Types: CWE-306 | CWE-306 CWE-306

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNACVSS8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Fourth Frontier Frontier X Android Application affected 15.0.0 custom Not specified
CNA Fourth Frontier Frontier X IOS Application affected 25.0.0 custom Not specified
CNA Fourth Frontier Frontier X2 affected All versions Not specified

References

ReferenceSourceLinkTags
fourthfrontier.com/pages/contact-us [email protected] fourthfrontier.com
github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsma-26-1... [email protected] github.com
www.cisa.gov/news-events/ics-medical-advisories/icsma-26-148-01 [email protected] www.cisa.gov
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Shakir Zari and Jerin Sunny reported this vulnerability to CISA. (en)

Additional Advisory Data

Workarounds

CNA: 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.

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