Termix RCE via Container ID Injection (CVE-2026-42454)
A critical remote code execution (RCE) vulnerability, CVE-2026-42454, has been identified in Termix, a web-based server management platform. The National Vulnerability Database reports that prior to version 2.1.0, Termix failed to properly sanitize or validate the containerId parameter in URL paths and WebSocket messages. This flaw impacts Docker container management endpoints, which directly interpolate this user-controlled input into shell commands executed on remote managed servers via ssh2.Client.exec().
An authenticated attacker can exploit this vulnerability by crafting a malicious container ID. This allows for arbitrary OS command injection, leading to RCE on any server managed by the Termix instance. With a CVSS score of 9.9 (Critical) and classified under CWE-78 (Improper Neutralization of Special Elements used in an OS Command), this is a severe issue that grants attackers full control over compromised systems.
Termix users are strongly advised to upgrade to version 2.1.0 or later immediately. Failure to patch leaves managed servers exposed to complete compromise from an authenticated user, turning a server management tool into an attacker’s gateway. Defenders must prioritize this patch to neutralize a direct path to their infrastructure.
What This Means For You
- If your organization uses Termix for server management, you are exposed to critical RCE. Check your Termix version immediately. Patch to version 2.1.0 or newer without delay. Audit logs for any anomalous shell command executions or container ID manipulations on your managed servers.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
Termix Container ID Injection RCE - CVE-2026-42454
title: Termix Container ID Injection RCE - CVE-2026-42454
id: scw-2026-05-08-ai-1
status: experimental
level: critical
description: |
Detects attempts to exploit CVE-2026-42454 by injecting shell metacharacters (like backticks, semicolons, pipes, command substitution, or double ampersands) into the 'containerId' parameter within the Termix web interface. This indicates an attempt to achieve RCE by manipulating the container ID to execute arbitrary OS commands via ssh2.Client.exec().
author: SCW Feed Engine (AI-generated)
date: 2026-05-08
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-42454/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/api/v1/containers/'
cs-uri-query|contains:
- 'containerId='
cs-uri-query|contains:
- '`'
cs-uri-query|contains:
- ';'
cs-uri-query|contains:
- '|'
cs-uri-query|contains:
- '$()'
cs-uri-query|contains:
- '&&'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-42454 | RCE | Termix web-based server management platform |
| CVE-2026-42454 | RCE | Termix versions prior to 2.1.0 |
| CVE-2026-42454 | Command Injection | Termix Docker container management endpoints |
| CVE-2026-42454 | Command Injection | Termix containerId URL path parameter and WebSocket message field |
| CVE-2026-42454 | Command Injection | Termix ssh2.Client.exec() function |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 09, 2026 at 02:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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