---
title: "CVE-2026-111459: Moxa Remote Connect Suite - Weak Cryptography"
description: "Moxa Remote Connect Suite (MRC Client) contains an improper certificate validation vulnerability caused by insufficient validation of server certificates, letting unauthenticated attackers with on-path access impersonate trusted servers and conduct man-in-the-middle attacks, exploit requires attacker to have on-path network access."
url: https://panop.io/threat-heartbeat/CVE-2026-111459/
---

# CVE-2026-111459 Moxa Remote Connect Suite - Weak Cryptography

Moxa Remote Connect Suite (MRC Client) contains an improper certificate validation vulnerability caused by insufficient validation of server certificates, letting unauthenticated attackers with on-path access impersonate trusted servers and conduct man-in-the-middle attacks, exploit requires attacker to have on-path network access.

CVSS base score 7.6 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.17% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-111459)

## Details

Type

Weak Cryptography

Impact

Man In The Middle, Information Disclosure, Data Tampering

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/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

Published

27 October 2026

Updated

29 October 2026

Weakness

[CWE-295](https://cwe.mitre.org/data/definitions/295.html)

## Vendor fix

Update to the latest version with proper certificate validation.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-111459](https://nvd.nist.gov/vuln/detail/CVE-2026-111459)
- [https://www.moxa.com/en/support/product-support/security-advisory/mpsa-269510-cve-2026-111459-cve-2026-111460-cve-2026-111461-vulnerabilities-in-moxa-remote-connect-suite-mrc-client](https://www.moxa.com/en/support/product-support/security-advisory/mpsa-269510-cve-2026-111459-cve-2026-111460-cve-2026-111461-vulnerabilities-in-moxa-remote-connect-suite-mrc-client)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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