Myth-Busting SOP: 'Setting One Security Header Is Good Enough'

Myth-Busting SOP: 'Setting One Security Header Is Good Enough'

Adding X-Frame-Options and calling it done leaves clickjacking partly open and ignores sniffing, referrer leaks, and feature abuse. Headers work as a set. Deploy the full baseline:

— Step 1: X-Content-Type-Options: nosniff — stop MIME-sniffing attacks.
— Step 2: Content-Security-Policy: frame-ancestors 'self' — the modern replacement for X-Frame-Options.
— Step 3: Referrer-Policy: strict-origin-when-cross-origin — stop leaking full URLs.
— Step 4: Permissions-Policy: geolocation=(), camera=(), microphone=() — disable unused APIs.
— Step 5: Verify all five on securityheaders.com and confirm none are duplicated (plugin + server) causing conflicts.

One header is a gap, not a policy. Run this every time.