Missing Security Headers
Overview
HTTP security headers instruct the browser to enable additional protections. Missing headers expose applications to:
- Missing HSTS: Downgrade attacks, MITM on first connection
- Missing CSP: XSS amplification
- Missing X-Content-Type-Options: MIME sniffing attacks
- Missing Referrer-Policy: Sensitive URL leakage in Referer header
- Missing Permissions-Policy: Feature abuse (camera, microphone, geolocation)
Recommended Headers
Strict-Transport-Security: max-age=31536000; includeSubDomains
Content-Security-Policy: default-src 'self'
X-Content-Type-Options: nosniff
X-Frame-Options: DENY
Referrer-Policy: strict-origin-when-cross-origin
Permissions-Policy: geolocation=(), microphone=(), camera=()