---
id: CVE-2026-86326
title: "An improper verification of cryptographic signature vulnerability exists in protocol gateways\_because the device does not properly verify the cryptographic authenticity of firmware images before installation"
summary: "An improper verification of cryptographic signature vulnerability exists in protocol gateways\_because the device does not properly verify the cryptographic authenticity of firmware images before installation. An attacker with high privil…"
severity: high
cvss: 8.6
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'
cwe:
  - CWE-347
vendor: Moxa
product: MGate MB3170 Series
affected:
  - mgate_mb3170_series 1.0
  - mgate_mb3270_series 1.0
published: '2026-10-02'
updated: '2026-10-02'
sourceUpdated: '2026-10-02T11:17:36.330'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86326'
references:
  - url: >-
      https://www.moxa.com/en/support/product-support/security-advisory/mpsa-269540-cve-2026-86325,-cve-2026-86326-two-vulnerabilities-in-protocol-gateways
    label: psirt@moxa.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-02T10:37:09.559538Z'
cvssSource: cna
ingestedAt: '2026-10-02T11:16:44.276Z'
---

## Overview

An improper verification of cryptographic signature vulnerability exists in protocol gateways because the device does not properly verify the cryptographic authenticity of firmware images before installation. An attacker with high privileges and access to the firmware update interface could provide a specially crafted or modified firmware image, causing it to be installed on the device. Successful exploitation could allow the attacker to execute unauthorized code, compromise the integrity and availability of the device, and persist malicious modifications across subsequent firmware updates.

## Remediation

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