# CVE-2026-111459: Moxa Remote Connect Suite improper certificate validation

Source: https://junglewise.ai/threats/cve-2026-111459-an-improper-certificate-validation-vulnerability-exists-in-moxa  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-27. Updated: 2026-10-27  
License: CC BY 4.0 with a link back

CVE-2026-111459 · Severity: info · Published 2026-10-27

Moxa Remote Connect Suite (MRC Client) is a secure remote access tool used to connect to industrial devices and systems. An attacker positioned on the network between a client and server could impersonate the server due to improper certificate validation, allowing them to intercept and modify all communications passing through the connection.

Vendors: [Moxa](https://junglewise.ai/threats/vendors/moxa).

## Quick answers

**Is CVE-2026-111459 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-111459 being exploited in the wild.

**How severe is CVE-2026-111459?** Informational severity, published 27 October 2026.

**Which products and versions are affected?** Moxa Remote Connect Suite (MRC Client).

**Is there a fix for CVE-2026-111459?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-111459 attacked?** It is attacked over the network or from the adjacent network, in a web application.

**Am I affected by CVE-2026-111459?** Check whether you run Moxa Remote Connect Suite (MRC Client). Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an improper certificate validation flaw in MRC Client's communication with its server. An unauthenticated attacker with on-path access can conduct a man-in-the-middle attack by impersonating a trusted server, compromising confidentiality and integrity of communications between the client and server.

## Affected products

- Moxa Remote Connect Suite (MRC Client)

## 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](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)