CVE-2026-112136 in Mendix Studio Pro
Summary
by MITRE • 11/10/2026
A vulnerability has been identified in Mendix Studio Pro 11 (All versions >= V11.15.0 < V11.16.0), Mendix Studio Pro 11.12 (All versions >= V11.12.6 < V11.12.7). The affected products MCP Server does not properly restrict its HTTP listener to the loopback interface, leaving it potentially exposed to remote systems. This could allow an attacker with network access to interact with the MCP Server remotely.
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Analysis
by VulDB Data Team • 11/10/2026
The identified vulnerability in Mendix Studio Pro versions 11.15.0 through 11.16.0 and version 11.12.6 through 11.12.7 represents a critical misconfiguration within the Model Context Protocol server component, commonly referred to as MCP Server. This flaw stems from an improper binding configuration where the HTTP listener is not restricted exclusively to the loopback interface, also known as localhost or 127.0.0.1. In standard secure development practices, services that are intended for local use only must bind strictly to this internal network interface to ensure they remain inaccessible from external networks. By failing to enforce this restriction, the application inadvertently exposes its management and control interfaces to any system capable of reaching the host machine over the network, including potentially untrusted or public-facing networks depending on the deployment environment.
From a technical perspective, this issue is classified under CWE-284 Improper Access Control, specifically relating to insufficient restrictions placed upon security-relevant configurations. The vulnerability allows an attacker who has achieved network access to the affected host to interact directly with the MCP Server's HTTP endpoints. This exposure bypasses local-only execution constraints that are typically designed to limit attack surfaces for development tools and internal management services. If the server is running on a machine connected to a corporate LAN, a cloud instance, or any other accessible network segment, remote entities can initiate connections without requiring prior authentication through standard application-level controls, assuming no additional firewall rules or network segmentation policies are in place to mitigate this exposure.
The operational impact of this vulnerability is significant due to the nature of development tools like Mendix Studio Pro. These environments often contain sensitive project files, configuration data, and potentially credentials used for connecting to backend systems during local testing. An attacker with remote access could exploit this open port to enumerate services, attempt further exploitation against other running processes on the host, or exfiltrate confidential source code and application logic stored within the Mendix workspace directories. In worst-case scenarios where additional vulnerabilities exist in the MCP Server implementation itself, such as command injection or arbitrary file read capabilities, a remote attacker could achieve full system compromise by leveraging this network exposure to execute malicious payloads with the privileges of the user running the Studio Pro instance.
This vulnerability aligns with MITRE ATT&CK technique T1046 Network Service Discovery, where adversaries probe for open ports and services to identify potential entry points or lateral movement paths within a compromised environment. It also relates to T1592 Gather Victim Host Information, as the exposed service may reveal details about the operating system, installed software versions, and network topology through standard HTTP responses or error messages. The lack of interface binding restriction effectively transforms a local-only tool into a remotely accessible service, increasing the attack surface significantly beyond what was originally intended by the developers.
To mitigate this risk, immediate action is required to restrict the MCP Server's listening address. Administrators should configure the application settings or environment variables associated with the Mendix Studio Pro installation to bind specifically to 127.0.0.1 rather than 0.0.0.0 or all available interfaces. If configuration options are limited, network-level controls such as host-based firewalls (e.g., iptables on Linux, Windows Defender Firewall on Windows) should be updated to block inbound traffic to the specific port used by the MCP Server from any source other than localhost. Additionally, organizations should review their internal network segmentation policies to ensure that development workstations are isolated from production networks and untrusted zones. Users affected by this vulnerability must upgrade to Mendix Studio Pro version 11.16.0 or later for versions starting at 11.15.0, or version 11.12.7 or later for the 11.12 branch, as these releases contain the necessary code changes to enforce proper interface binding by default. Until patches are applied, restricting network access via firewall rules is the most effective immediate countermeasure.