Command Injection in Guardian Language-System via speech_text.php

Executive Summary

CVE-2026-34113 is an unauthenticated OS command injection vulnerability in the Guardian language-system, specifically in the speech_text.php file.

The vulnerability occurs because the 'id' GET parameter is passed directly into a PHP exec() call without any sanitization or validation.

This allows an unauthenticated remote attacker to append shell metacharacters to the 'id' parameter and execute arbitrary operating system commands on the server.

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Impact Analysis

This vulnerability can have severe impacts because it allows an attacker to execute arbitrary OS commands on the affected server without any authentication.

Potential impacts include unauthorized access, data theft, data modification, service disruption, or complete system compromise.

Since the attacker does not need to be authenticated, the risk of exploitation is high.

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Detection Guidance

This vulnerability can be detected by testing the 'id' GET parameter in the speech_text.php file for command injection. Since the parameter is passed directly into a PHP exec() call without sanitization, sending specially crafted requests with shell metacharacters can reveal if arbitrary commands are executed.

For example, you can use curl or wget to send requests that include shell commands appended to the 'id' parameter and observe the server response or behavior.

• curl "http://<target>/speech_text.php?id=1;whoami"
• curl "http://<target>/speech_text.php?id=1;ls -la"
• curl "http://<target>/speech_text.php?id=1;cat /etc/passwd"

If the server executes these commands and returns output or behaves differently, it indicates the presence of the vulnerability.

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Mitigation Strategies

Immediate mitigation steps include restricting access to the vulnerable speech_text.php endpoint to trusted users or internal networks to prevent unauthenticated exploitation.

Additionally, applying input validation and sanitization on the 'id' GET parameter to prevent shell metacharacters from being executed is critical.

If possible, update or patch the Guardian language-system to a version where this vulnerability is fixed.

As a temporary measure, consider disabling or removing the vulnerable functionality until a proper fix is applied.

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