External risk intelligence

Termix Broken Access Control Vulnerability Allows Remote Command Execution

CVE advisorySeverity: CRITICAL (CVSS 9.0)

CVE-2026-45746

Termix is a web-based server management platform designed to be accessed over a network to manage remote VPS instances. Given its role as a centralized web interface for terminal and file management, such applications are commonly deployed as internet-facing portals or edge services to allow administrators remote access to their infrastructure.

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 has been identified in the Termix web-based server management platform, affecting its File Manager functionality. This issue allows an unauthorized attacker to potentially access and manipulate files and execute commands on another user's remote server, posing a significant security risk. The problem has been addressed in version 2.3.2.

Unauthenticated access to other users' server files.
Controls access to remote servers, impacting data integrity.
Confirm Termix usage and update to version 2.3.2.

Attack Path

How an attacker could exploit the issue

An attacker could gain unauthorized access to active File Manager sessions by manipulating a session identifier. This allows them to interact with another user's remote filesystem and potentially execute commands on their VPS.

Attacker needs low access.
Manipulate session ID.
Remote command execution.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an attacker to access and manipulate active file manager sessions belonging to other users, leading to unauthorized interaction with remote filesystems and direct command execution on another user's VPS. This is possible when an authenticated user interacts with the File Manager functionality.

Remote VPS filesystems and command execution.
Manipulating session identifiers.
Unauthorized file access and command execution.

Operational Fix

Recommended remediation, mitigation, and detection steps

The Termix platform, used for web-based server management including SSH terminals and file operations, has a critical Broken Access Control vulnerability. This allows an authenticated attacker to access and manipulate other users' active File Manager sessions, potentially leading to remote command execution on their VPS. The first practical step is to identify all Termix instances, determine their exposure and criticality, locate the accountable owners, and then plan remediation.

Identify Termix instances and owners.
Verify session reachability and business impact.
Plan remediation by risk and maintenance windows.

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 provides a centralized interface for server administration. Users typically employ it to handle SSH terminal connections, manage remote files on virtual private servers (VPS), and establish secure tunneling from a browser.

What does Broken Access Control mean for CVE-2026-45746?

This vulnerability, classified as Broken Access Control, occurs when an application fails to properly restrict what a user is allowed to do. In this case, the system incorrectly trusts a session identifier provided by the user without verifying if it actually belongs to their own account. This flaw allows an attacker to manipulate that identifier to impersonate another active user session.

How can an attacker trigger this vulnerability?

An attacker triggers the flaw by manipulating the sessionId parameter within the File Manager component. Simply browsing the site or being unauthenticated does not trigger this; the system requires an active, authenticated user to be interacting with the File Manager. By guessing or intercepting a valid session ID, an attacker hijacks the session to gain unauthorized control over the associated remote VPS.

Is my Termix instance at risk?

If your Termix installation is internet-facing, Halo Surface Signal identifies it as a likely target because such platforms are frequently deployed as edge services for remote infrastructure access. If your instance is restricted to internal networks, the risk is lower but still present if an attacker gains a foothold inside your network.

How do I fix the CVE-2026-45746 vulnerability?

The primary response is to upgrade your Termix software to version 2.3.2 or later, which contains the fix for this access control issue. Before updating, identify all running instances of Termix in your environment, determine their current versions, and coordinate with the relevant system owners to apply the patch during your next maintenance cycle.

References

github.com/Termix-SSH/Termix/security/advisories/GHSA-cx2r-843c-…

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.