How do I fix the trusted-types-xss audit test in WebCare Pro Auditor?

Define a Content-Security-Policy header enforcing require-trusted-types-for 'script'. Refactor innerHTML assignments to use textContent or trusted sanitizer libraries (e.g. DOMPurify). Create trusted type policy factories using window.trustedTypes.createPolicy.

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Standards StandardsTest ID: trusted-types-xssVerified Specification

Preventing DOM XSS with Trusted Types & CSP Policies

Deploying W3C Trusted Types and modern Content Security Policies (CSP) to eliminate client-side DOM Cross-Site Scripting vulnerabilities.

Why this matters for your SEO & AI Visibility:

DOM-based XSS allows attackers to execute malicious scripts in user browsers, stealing session cookies and hijacking client interactions.

Step-by-Step Remediation Guide

3 Actionable Steps

1Define a Content-Security-Policy header enforcing require-trusted-types-for 'script'.
2Refactor innerHTML assignments to use textContent or trusted sanitizer libraries (e.g. DOMPurify).
3Create trusted type policy factories using window.trustedTypes.createPolicy.

Production Implementation Code

javascript

Copy and deploy this production snippet into your application to satisfy the audit test.

trusted-types-xss configuration snippet

// Create a Trusted Types policy for sanitizing HTML
if (window.trustedTypes && window.trustedTypes.createPolicy) {
  const sanitizePolicy = window.trustedTypes.createPolicy('default', {
    createHTML: (string) => DOMPurify.sanitize(string),
  });
}

Technical Architecture & In-Depth Details

Why Enterprise Platforms Require Trusted Types

Legacy CSP rules control where scripts are loaded from, but fail to prevent DOM-based XSS caused by dangerous JavaScript sinks (like element.innerHTML). Trusted Types close this gap by validating data before it reaches DOM sinks.