EssentialHeaders

EssentialHeaders is a focused WordPress plugin that attaches the HTTP security headers browsers expect, so protection is not left to chance or buried in server config.

Under Settings → EssentialHeaders you get three tabs:

• Headers — overview of which headers are enabled and will be sent
• Settings — toggles and editable values for each header
• About — plugin info

Headers covered:

• Content-Security-Policy (CSP)
• Strict-Transport-Security (HSTS)
• X-Frame-Options
• X-Content-Type-Options
• Referrer-Policy
• Permissions-Policy

Safer headers ship enabled with sensible defaults. CSP starts off so you can adopt it deliberately. Headers apply to public site responses (pages, feeds, and the login screen)—not wp-admin, AJAX, REST, GraphQL, JSON API, or XML-RPC. HSTS is only sent over HTTPS. Default HSTS uses max-age only; add includeSubDomains yourself when every subdomain is ready.