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check-command-injection

Analyzes PHP code for command injection vulnerabilities. Detects shell_exec, exec, system, passthru with user input, missing escapeshellarg/escapeshellcmd.

skills/check-command-injection/SKILL.md

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Aug 16, 2026
License
MIT

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# Command Injection Security Check

Analyze PHP code for OS command injection vulnerabilities (OWASP A03:2021).

## Detection Patterns

### 1. Direct Command Execution with User Input

```php
// CRITICAL: shell_exec with user input
$output = shell_exec("ls " . $_GET['dir']);
$output = shell_exec("ping -c 3 {$host}");

// CRITICAL: exec with user input