# Improper Restriction of XML External Entity Reference (CWE-611)

The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

**Stack:** JavaScript

- Prevalence: Moyenne 3 langages couverts
- Impact: Élevé 3 règles de sévérité élevée
- Prevention: Documentée 3 exemples de correctifs

**OWASP:** Security Misconfiguration (A05:2021-Security Misconfiguration) - #5

## Description

XML External Entity (XXE) attacks exploit features of XML parsers to read local files, perform server-side request forgery, or cause denial of service.

## Prevention

Stratégies de prévention pour XML External Entity (XXE) basées sur 1 règles de détection Shoulder.

### JavaScript

Disable external entity processing in XML parsers or use JSON instead of XML

## Warning Signs

- [HIGH] unsafe XML parsing that could allow XML External Entity (XXE) attacks

## Consequences

- Lecture des données de l'application
- Lire des fichiers ou des répertoires
- DoS

## Mitigations

- Désactivez le traitement des entités externes dans les analyseurs XML
- Utilisez des formats de données moins complexes comme JSON lorsque c'est possible
- Validez et assainissez les entrées XML

## Detection

- Total rules: 3
- Languages: go, javascript, typescript, python

## Rules by Language

### Javascript (1 rules)

- **XML External Entity (XXE) Injection** [HIGH]: Detects unsafe XML parsing that could allow XML External Entity (XXE) attacks.
XXE can lead to file disclosure, SSRF, denial of service, and other attacks.
  - Remediation: Disable external entity processing or use JSON instead of XML.

```javascript
const { XMLParser } = require('fast-xml-parser');
const parser = new XMLParser({ processEntities: false });
const result = parser.parse(xmlData);
```

Learn more: https://shoulder.dev/learn/javascript/cwe-611/xxe

### Typescript (1 rules)

- **XML External Entity (XXE) Injection** [HIGH]: Detects unsafe XML parsing that could allow XML External Entity (XXE) attacks.
XXE can lead to file disclosure, SSRF, denial of service, and other attacks.
  - Remediation: Disable external entity processing or use JSON instead of XML.

```javascript
const { XMLParser } = require('fast-xml-parser');
const parser = new XMLParser({ processEntities: false });
const result = parser.parse(xmlData);
```

Learn more: https://shoulder.dev/learn/javascript/cwe-611/xxe