Jay Suthar

BoundaryGuard Headers enforces modern HTTP security headers to harden your WordPress site against XSS, clickjacking, mixed content, and cross-origin attacks.
Key Features:
<ul>
<li>Essential Protection: Adds X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and Permissions-Policy to reduce attack surface and prevent clickjacking.</li>
<li>HSTS (Strict Transport Security): Forces HTTPS connections to help prevent protocol downgrade and man-in-the-middle attacks.</li>
<li>Advanced Isolation (COOP/COEP): Enables Cross-Origin-Opener-Policy and Cross-Origin-Embedder-Policy to improve cross-origin isolation and mitigate certain side-channel attacks.</li>
<li>Content Security Policy (CSP): One of the strongest defenses against XSS. Includes a dashboard-based CSP builder with preset options to whitelist trusted sources for scripts, styles, images, and more.</li>
<li>CSP Report-Only Mode: Test your policy safely without blocking content.</li>
<li>Server Header Hardening: Removes or limits exposure of headers such as <code>X-Powered-By</code> and <code>Server</code>.</li>
<li>Lightweight and Fast: Uses PHP headers for broad server compatibility and minimal performance impact.</li>
<li>No <code>.htaccess</code> Editing Required: Works without modifying server configuration files.</li>
</ul>
Designed for developers and site owners who want stronger security without unnecessary complexity.
<h3>External Services</h3>
This plugin provides a Content Security Policy (CSP) builder. To assist users, it includes “Preset Buttons” that allow users to quickly add domain names to their own CSP whitelist.
This plugin DOES NOT connect to, load data from, or send data to these services automatically. The following third-party domains are referenced as presets within the admin dashboard for whitelisting purposes: 
* Google Analytics (www.google-analytics.com) – Used for tracking whitelisting. [Privacy: https://policies.google.com/privacy] 
* Google Tag Manager (www.googletagmanager.com) – Used for tag management. [Privacy: https://policies.google.com/privacy] 
* Stripe (js.stripe.com, api.stripe.com) – Used for payment processing. [Privacy: https://stripe.com/privacy] 
* Facebook (www.facebook.com, connect.facebook.net) – Used for social embeds. [Privacy: https://www.facebook.com/policy.php] 
* YouTube (www.youtube.com, i.ytimg.com) – Used for video embeds. [Privacy: https://policies.google.com/privacy] 
* Vimeo (player.vimeo.com) – Used for video embeds. [Privacy: https://vimeo.com/privacy] 
* Gravatar (secure.gravatar.com) – Used for user avatars. [Privacy: https://automattic.com/privacy/]

BoundaryGuard Headers


Simple, lightweight, and effective. The CSP Builder and security header options make it easy to strengthen WordPress security without complicated server configuration. Highly recommended.


Easy and Powerful Security Headers Management

Automatically enforces essential HTTP security headers to protect your site from XSS, clickjacking, and protocol downgrade attacks.

Justin Kopepasah

Strict Security Headers is a straightforward and lightweight plugin designed to enhance the security of your WordPress website by implementing modern security headers. Simply activate the plugin, and the headers are automatically added, there’s absolutely no configuration needed!
<h3>Features</h3>
<ol>
<li>Simple and Lightweight: No configuration needed, just activate the plugin to enhance your website security.</li>
<li>Enhanced Security: Helps in protecting your website against various types of attacks and vulnerabilities.</li>
<li>No Performance Impact: Strict Security Headers is developed to have minimal impact on your website’s performance.</li>
</ol>
<h3>Additional Notes</h3>
For any issues, queries, or enhancements, please refer to the plugin support forum. Regular updates and enhancements will be rolled out to ensure optimum functionality and security of the plugin.
Please consider sponsoring development to support the continued development and maintenance of this plugin: https://github.com/sponsors/kopepasah

Strict Security Headers

Easily enable modern security headers for your website with the Strict Security Headers plugin, with no configuration required.

BoundaryGuard Headers vs Strict Security Headers