CVE-2026-86326
Summary
| CVE | CVE-2026-86326 |
|---|---|
| State | PUBLISHED |
| Assigner | Moxa |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-10-02 11:17:36 UTC |
| Updated | 2026-10-02 19:10:09 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v4.0 8.6 HIGH from [email protected]
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Problem Types: CWE-347 | CWE-347 CWE-347: Improper Verification of Cryptographic Signature
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 8.6 | HIGH | 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/E:X/C... |
| 4.0 | CNA | CVSS | 8.6 | HIGH | 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 |
CVSS v4.0 Breakdown
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Moxa | MGate MB3170 Series | affected 1.0 | Not specified |
| CNA | Moxa | MGate MB3270 Series | affected 1.0 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| www.moxa.com/en/support/product-support/security-advisory/mpsa-269540-cve-... | [email protected] | www.moxa.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Additional Advisory Data
Solutions
CNA: Users are advised to follow the applicable Security Hardening Guide for the MGate MB3000 or MGate 5000 Series when obtaining and updating firmware. The guides provide recommendations for securely obtaining firmware from official Moxa sources and performing firmware updates. Users should follow the applicable guidance to ensure that the correct and trusted firmware is obtained and that firmware updates are performed securely. For detailed mitigation guidance, please refer to the following Security Hardening Guides: * The Security Hardening Guide for the MGate 5000 Series * The Security Hardening Guide for the MGate MB3000 Series