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check-xxe

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Analyzes PHP code for XML External Entity vulnerabilities. Detects unsafe XML parsers, missing entity protection, LIBXML flags issues, XSLT attacks.

skills/check-xxe/SKILL.md

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Aug 16, 2026
License
MIT

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# XXE (XML External Entity) Security Check

Analyze PHP code for XXE vulnerabilities (OWASP A03:2021).

## Detection Patterns

### 1. SimpleXML without Protection

```php
// CRITICAL: User input directly to simplexml
$xml = simplexml_load_string($_POST['xml']);
$xml = simplexml_load_file($_FILES['upload']['tmp_name']);

// CRITICAL: Default options allow entities
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