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Security March 28, 2026 · 8 min read

Security Headers for WordPress: What to Set and Why

Security headers harden your WordPress site at the browser layer. This guide explains the essential headers, safe defaults, and how to deploy them without breaking your site.

FP

FyrePress Team

WordPress Developer Tools

TL;DR

  • Security headers reduce browser-level attack surface and enforce safer defaults.
  • Start with HSTS, X-Frame-Options, X-Content-Type-Options, and Referrer-Policy.
  • Roll out Content-Security-Policy gradually to avoid breaking scripts.

Why Security Headers Matter

Security headers tell the browser how to handle your site. They block common attacks like clickjacking, MIME sniffing, and mixed-content downgrades. For WordPress, they are an essential layer alongside strong passwords, updates, and server hardening.

Headers are cheap wins: they are fast to add, easy to audit, and they reduce risk before any plugin code runs.

Must-Have Headers (Safe Defaults)

  • Strict-Transport-Security (HSTS) forces HTTPS after the first secure request.
  • X-Frame-Options prevents clickjacking in iframes.
  • X-Content-Type-Options blocks MIME sniffing.
  • Referrer-Policy limits referrer leakage.

Use the Security Headers Generator to produce a clean, ready-to-paste header block.

Content-Security-Policy (CSP)

CSP is the most powerful header and the easiest to break if you deploy it too aggressively. Start with a report-only policy, audit violations, then tighten it gradually.

  • Begin with Content-Security-Policy-Report-Only.
  • Whitelist only the scripts and styles you control.
  • Remove inline scripts when possible to simplify policy.

WordPress-Specific Considerations

Themes and plugins often inject inline scripts, iframes, and third-party assets. If CSP or X-Frame-Options break your admin or front-end, revise the policy rather than disabling headers entirely.

  • Test with your page builder and analytics scripts.
  • Apply stricter policies on public pages first, then admin.
  • Use a staging environment to validate changes safely.

How to Deploy Safely

Add headers at the server layer for consistency. Apache users can apply them in .htaccess; Nginx users should add them in the server block config.

Pair this with the .htaccess Generator if you need safe baseline rules.

Frequently Asked Questions

What are the most important security headers?
The most essential headers for every site are Strict-Transport-Security (HSTS), X-Frame-Options, X-Content-Type-Options, and Referrer-Policy. These provide a strong baseline of browser-level protection.
Will security headers break my site?
Most headers are safe with standard defaults. However, Content-Security-Policy (CSP) can block legitimate scripts if not configured carefully. Always deploy CSP in "Report-Only" mode first to audit violations before enforcing it.
Where is the best place to add security headers?
Adding headers at the server level (via .htaccess for Apache or server blocks for Nginx) is the most reliable method. This ensures they are sent before any WordPress code or caching layers execute.

Key Takeaways

  • Start with safe headers and expand to CSP over time.
  • Deploy at the server layer for maximum reliability.
  • Test across themes and plugins before production rollout.
Tags: Security Headers CSP HSTS WordPress Security

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