---
id: "CVE-2026-111459"
kind: "vulnerability"
aliases: ["CVE-2026-111459"]
title: "Moxa MRC Client: improper certificate validation enables server impersonation"
severity: "high"
cvss: 7.6
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["industrial-ot", "infrastructure", "moxa", "mrc-client", "remote-access"]
not_affected_if: ["unknown"]
published_at: "2026-10-27T08:16:52+00:00"
first_seen_at: "2026-10-27T08:31:46+00:00"
updated_at: "2026-10-27T08:32:28+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-111459", "first_seen_at": "2026-10-27T08:31:46+00:00"}]
---

# Moxa MRC Client: improper certificate validation enables server impersonation

The Moxa Remote Connect Suite MRC Client does not properly validate server certificates under certain conditions. An on-path attacker can impersonate the trusted server and read or alter traffic between client and server.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- unknown

## Fix

- unknown

## Timeline

- 2026-10-27T08:31:46+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-111459

## From the sources

An improper certificate validation vulnerability exists in Moxa Remote Connect Suite (MRC Client). Under certain conditions, an unauthenticated attacker with on-path access to the communication between the MRC Client and its server could impersonate a trusted server and conduct a man-in-the-middle attack, potentially compromising the confidentiality and integrity of communications.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_