CVE-2026-14448: Authenticated OS Command Injection in MB connect line and Helmholz Products

A critical authenticated OS command injection vulnerability, tracked as CVE-2026-14448, has been identified in the system_certificates view of several products from MB connect line and Helmholz. Specifically, this affects MB connect line's mbCONNECT24 and mymbCONNECT24, and Helmholz's myREX24V2 and myREX24V2.virtual, across all versions up to and including 2.20.0. The flaw stems from improper neutralization of special elements within an OS command, enabling a high-privileged remote attacker to inject and execute arbitrary system commands. This direct command execution can lead to a complete compromise of the affected system's confidentiality, integrity, and availability. While specific exploitation details are not yet public, the nature of the vulnerability suggests significant risk for affected organizations, particularly those utilizing these products in industrial or remote access scenarios.

Attack Chain

1. An attacker obtains high-privileged authentication credentials for a vulnerable MB connect line or Helmholz application.
2. The attacker establishes a remote connection to the vulnerable web application interface.
3. The attacker navigates to or interacts with the system_certificates view or functionality within the application.
4. Leveraging the improper neutralization of special elements, the attacker injects malicious OS command metacharacters and a payload (e.g., shell commands) into an input parameter or field.
5. The vulnerable application processes the attacker-controlled input, inadvertently executing the injected OS command with the privileges of the underlying service.
6. The executed command payload establishes persistence, facilitates data exfiltration, performs system configuration changes, or deploys further malicious tooling.
7. The attacker achieves full remote code execution, compromising the confidentiality, integrity, and availability of the affected system.

Impact

Successful exploitation of CVE-2026-14448 grants a high-privileged remote attacker the ability to execute arbitrary operating system commands. This directly translates to a total loss of confidentiality, allowing attackers to access sensitive system data; a total loss of integrity, enabling unauthorized modification of system files and configurations; and a total loss of availability, potentially leading to denial-of-service or complete system shutdown. Organizations using affected versions of mbCONNECT24, mymbCONNECT24, myREX24V2, and myREX24V2.virtual face severe operational disruption and data compromise if exploited.

Recommendation

• Prioritize patching all affected MB connect line and Helmholz products to a version that addresses CVE-2026-14448 immediately.
• Deploy the Sigma rule "Detects CVE-2026-14448 Exploitation - OS Command Injection in System Certificates View" to your SIEM system and monitor for suspicious HTTP requests targeting the system_certificates view with OS command injection patterns.
• Review web server access logs for cs-uri-stem and cs-uri-query fields containing the /system_certificates path combined with shell metacharacters, as identified in the Sigma rule.
• Implement robust authentication mechanisms, including multi-factor authentication, to prevent unauthorized access to high-privileged accounts, which are a prerequisite for exploiting CVE-2026-14448.