Unsanitized user input in HTTP response (XSS)

• Rule ID: javascript_express_cross_site_scripting
• Languages: javascript
• Source: cross_site_scripting.yml

Description

Including unsanitized user input in HTTP responses exposes your application to cross-site scripting (XSS) attacks. This vulnerability allows attackers to inject malicious scripts into web pages viewed by other users.

Remediations

• Do not include user input directly in a response. This practice can lead to XSS vulnerabilities.

  res.send(req.body.data); // unsafe

• Do sanitize user input before including it in a response. Use library functions or frameworks designed for input sanitization to ensure that user data cannot be interpreted as executable code.

References

• OWASP Cross-Site Scripting (XSS) Cheatsheet

Associated CWE

• CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

OWASP Top 10

• A03:2021 - Injection

Configuration

To skip this rule during a scan, use the following flag

bearer scan /path/to/your-project/ --skip-rule=javascript_express_cross_site_scripting

To run only this rule during a scan, use the following flag

bearer scan /path/to/your-project/ --only-rule=javascript_express_cross_site_scripting