External risk intelligence

Mendix Studio Pro MCP Server Remote HTTP Listener Exposure

CVE advisorySeverity: CRITICAL (CVSS 9.2)

CVE-2026-112136

The affected component is Mendix Studio Pro, an integrated development environment used for building applications. While the HTTP listener is not restricted to the loopback interface, this tool is typically used in developer environments or local workstations rather than as a public-facing service. Remote exposure is possible if misconfigured on a network, but it is not a common internet-facing product.

Halo Surface Signal: 3 out of 5 — possibly public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A vulnerability has been identified in Mendix Studio Pro that could allow an attacker with network access to interact with the MCP Server remotely due to an improperly restricted HTTP listener.

Unrestricted server exposure to the network.
Impacts development tools, potentially affecting application integrity.
Verify relevance and exposure within your development environment.

Attack Path

How an attacker could exploit the issue

An attacker with network access could potentially interact with the MCP Server remotely due to its HTTP listener not being restricted to the loopback interface. This exposure allows an attacker to reach the vulnerable component and could lead to the described risks when exploited.

Network access required.
MCP Server HTTP listener.
Potential for high impact.

Live Threat

Current exploitation, exposure, and threat context

The MCP Server's HTTP listener, when not properly restricted to the loopback interface, could allow an attacker with network access to remotely interact with the server. This means that when supported by the advisory's conditions, an attacker could potentially affect the behavior of the MCP Server.

MCP Server service behavior at risk.
Remote network access can interact with the server.
Unauthorized service manipulation is possible.

Operational Fix

Recommended remediation, mitigation, and detection steps

The MCP Server's HTTP listener is not restricted to the loopback interface, making it potentially accessible from remote systems. This vulnerability requires immediate attention from the platform or infrastructure teams responsible for the Mendix Studio Pro deployment. The first step is to identify all instances of the affected technology, determine their network exposure, and confirm business criticality to prioritize remediation efforts.

Platform/Infrastructure teams own the issue.
Verify MCP Server network exposure and reachability.
Plan remediation based on identified risks.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is Mendix Studio Pro and the MCP Server?

Mendix Studio Pro is an integrated development environment (IDE) used by developers to build and manage business applications. Within this software, the MCP Server serves as a component that facilitates communication and background processes. It is typically designed to operate on a developer’s local workstation to support the application creation lifecycle rather than functioning as a traditional public-facing web server.

What does CVE-2026-112136 mean for my software?

This vulnerability is classified as CWE-1327: Improper Restriction of Network Interfaces. In plain terms, the MCP Server is intended to talk only to other processes on the same computer, but it currently listens for requests from across the entire network. This configuration flaw allows unauthorized parties who can reach your machine over the network to send commands or interact with the server as if they were sitting at your terminal.

How can an attacker trigger this vulnerability?

An attacker needs network access to the computer running the affected version of Mendix Studio Pro. If the computer is isolated or uses a strictly configured local firewall that blocks incoming connections to the MCP Server, the bug cannot be triggered remotely. The risk exists specifically when the MCP Server is reachable over a broader network, allowing remote systems to communicate with the service.

Is my instance of Mendix Studio Pro at risk?

Halo Surface Signal notes that while this tool is usually found on internal developer workstations, remote exposure is possible if the workstation is misconfigured to allow external network traffic. You should assess whether your development machines are placed on networks that permit unsolicited incoming connections, as this increases the likelihood of an attacker reaching the vulnerable MCP Server interface.

How should I respond to this advisory?

Your first step is to locate all machines running the affected versions of Mendix Studio Pro. Once identified, work with your infrastructure or platform teams to confirm if these instances are exposed to any network segments beyond the local device. Prioritize restricting access to these machines and evaluate the need for updates or configuration changes to ensure the MCP Server only accepts connections from the local loopback interface.

References

cert-portal.siemens.com/productcert/html/ssa-710379.html

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.