External risk intelligence

Termix SSH Tunnel Command Injection Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-45748

Termix is a web-based server management platform designed to provide SSH, tunneling, and file management capabilities. As a centralized management portal intended for remote access and infrastructure administration, it is commonly deployed as an internet-facing or edge-reachable service to facilitate administrative tasks from various locations.

OS Command Injection

Termix

2.1.0 to before 2.3.2

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability exists in Termix, a web-based server management platform, due to improper handling of user-supplied input in its SSH tunneling feature. This flaw could allow an unauthenticated attacker to execute arbitrary operating system commands on the server hosting Termix, potentially leading to a complete compromise of the affected system.

Vulnerability allows remote command execution.
Affects critical server management software.
Confirm relevance and assess exposure.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending a specially crafted request to the `POST /ssh/tunnel/connect` endpoint. This endpoint in Termix, when not properly secured, allows user-supplied data to be directly inserted into a system command. If an attacker can reach this endpoint, they can inject malicious commands that will be executed on the server hosting Termix, potentially leading to persistent compromise.

Entry condition: Network access to the vulnerable endpoint.
Trigger point: Sending a malicious `POST` request.
Resulting risk: Persistent command execution on the server.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an unauthenticated attacker to execute arbitrary operating system commands on the server hosting Termix when the `POST /ssh/tunnel/connect` endpoint is used, potentially leading to a complete compromise of the affected host.

Server OS command execution.
Via crafted `POST` request.
Full server compromise.

Operational Fix

Recommended remediation, mitigation, and detection steps

Termix administrators, platform teams, and potentially application owners managing critical infrastructure should prioritize this. The immediate first step is to inventory all Termix instances, determine their exposure and business criticality, and confirm the responsible team for remediation or vendor coordination.

Identify Termix instances and assess risk.
Confirm platform or application owner.
Plan coordinated remediation or vendor engagement.

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 Termix?

Termix is a web-based management platform that helps administrators handle server infrastructure. It provides a browser-based interface for SSH terminal access, managing file systems, and creating SSH tunnels. Because it acts as a centralized hub for remote system administration, it is often deployed to allow engineers to manage servers from anywhere.

What does CWE-78 mean for CVE-2026-45748?

CWE-78 identifies this vulnerability as OS Command Injection. In plain English, this means the software incorrectly combines user input with system-level commands. Because the application fails to sanitize or properly block characters, an attacker can insert their own commands into the software's internal processes, forcing the server to execute unintended, harmful instructions.

How is this vulnerability triggered?

An attacker triggers this flaw by sending a specifically crafted request to the /ssh/tunnel/connect endpoint. The vulnerability relies on the application failing to escape user-supplied data in fields like endpointIP or passwords. It is not triggered by normal, valid administrative use; it requires reaching that specific endpoint with malicious, injected command syntax.

Is my instance of Termix at risk?

Halo Surface Signal indicates that Termix is often deployed as an internet-facing service to facilitate remote access. If your instance is reachable from the public internet, it faces a higher level of risk because the affected endpoint can be reached without authentication. You should check if your deployment is exposed to the internet or restricted to an internal network.

How do I respond to this vulnerability?

Start by creating an inventory of all Termix instances running in your environment. Confirm which versions are currently active, as this issue affects versions before 2.3.2. Once mapped, identify the owners for each instance and coordinate an update to version 2.3.2 or later to apply the necessary security patches.

References

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.