Content-Security-Policy HTTP Header Missing

What Is This Issue?

Content Security Policy (CSP) is a security header that helps prevent cross-site scripting (XSS), clickjacking, and other code injection attacks. Without it, your site is more vulnerable to these common attack vectors.

Why This Matters

• XSS Prevention: CSP can block inline scripts and unauthorized sources
• Data Exfiltration: Limits where data can be sent
• Trust Signals: Security-conscious sites implement CSP

How to Implement

Add CSP as an HTTP header from your server:

Content-Security-Policy: default-src 'self'; script-src 'self' https://trusted-cdn.com; style-src 'self' 'unsafe-inline'; img-src 'self' data: https:;

Start with Report-Only

Test your policy first without blocking:

Content-Security-Policy-Report-Only: default-src 'self';