CVE-2026-86326
Received Received - Intake

Improper Cryptographic Signature Verification in Protocol Gateways

Publication date: 2026-10-02

Last updated on: 2026-10-02

Assigner: Moxa Inc.

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.

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Meta Information

Published
2026-10-02
Last Modified
2026-10-02
Generated
2026-10-02
AI Q&A
2026-10-02
EPSS Evaluated
N/A
NVD
CVE-2026-86326
EUVD
EUVD-2026-91373

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
moxa mgate_3000 *
moxa mgate_5000 *
moxa mb_series *
moxa eip_series *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-347 The product does not verify, or incorrectly verifies, the cryptographic signature for data.

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Executive Summary

CVE-2026-86326 is an improper verification of cryptographic signature vulnerability in Moxa protocol gateways. The device fails to properly verify the authenticity of firmware images before installation. An attacker with high privileges and access to the firmware update interface could exploit this by providing a specially crafted or modified firmware image, which would then be installed on the device.

Impact Analysis

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. This could lead to unauthorized access, data breaches, or disruption of device functionality.

Mitigation Strategies
  • Follow the applicable Security Hardening Guide for secure firmware updates as provided by Moxa.
  • Restrict network access to the firmware update interface to limit exposure.
  • Enhance authentication mechanisms for the firmware update process.
  • Regularly update firmware to the latest secure versions.

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