Protecting web applications against malicious script execution requires defense-in-depth: strict CSP headers, input sanitization, and secure cookie attributes.
1. Security Headers Configuration Checklist
- Content-Security-Policy (CSP): Enforce
default-src 'self'with cryptographic nonces for dynamic scripts, blocking unauthorized third-party script injection. - HTTP Strict Transport Security (HSTS): Enforce
max-age=63072000; includeSubDomains; preloadto mandate HTTPS encryption. - Cookie Security Attributes: Configure session cookies with
Secure; HttpOnly; SameSite=Strictto prevent client-side JavaScript theft.