Critical BLE Authentication Bypass in Fourth Frontier Frontier X Mobile App & Frontier X2 (CVE‑2026‑5768) Threatens Patient Safety
What It Is — The vulnerability (CVE‑2026‑5768) is a missing‑authentication flaw in the Bluetooth Low Energy (BLE) GATT interface of Fourth Frontier’s Frontier X2 medical device and its companion mobile applications. It allows an unauthenticated attacker within radio range to read and write arbitrary handle values, alter clinical readings, and commandeer device functions.
Exploitability — The issue is publicly disclosed, carries a CVSS v3.1 base score of 8.8 (Critical), and can be exploited with off‑the‑shelf BLE tools—no sophisticated zero‑day exploit is required.
Affected Products —
- Frontier X Android application < v15.0.0
- Frontier X iOS application < v25.0.0
- Frontier X2 device – all firmware versions
TPRM Impact — The flaw creates a direct supply‑chain risk for healthcare organizations that depend on Frontier X2 for patient monitoring. An attacker could tamper with vital signs, trigger false alarms, or cause denial‑of‑service, leading to patient‑harm incidents and regulatory liability for the purchasing entity.
Recommended Actions —
- Deploy the vendor‑provided patches: Android v15.0.0+, iOS v25.0.0+, and any Frontier X2 firmware updates.
- If patches are unavailable, isolate Frontier X2 devices from BLE networks and enforce strict physical proximity controls.
- Conduct a rapid risk assessment of all clinical workflows that ingest data from Frontier X2.
- Update third‑party risk registers, flagging Fourth Frontier as a high‑risk supplier until remediation is verified.
- Review contractual SLAs for security‑by‑design obligations and enforce remediation timelines.
Source: CISA Advisory – ICSMA‑26‑148‑01