Unsanitized user input in dynamic HTML insertion (XSS)

• Rule ID: javascript_lang_dangerous_insert_html
• Languages: javascript
• Source: dangerous_insert_html.yml

Description

There are XSS vulnerabilities when dynamically inserting HTML that contains unsanitized data.

Remediations

Make sure you use HTML sanitization library before inserting html

import sanitizeHtml from 'sanitize-html';

const html = `<strong>${user.Input}</strong>`;
document.body.innerHTML = sanitizeHtml(html)

Resources

• OWASP XSS explained

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_lang_dangerous_insert_html

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

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