The Complete Guide to Securing WordPress with X-Frame-Options & HTTPOnly Cookies

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Hey there! As a fellow technology geek, I know how important it is to lock down the security of our WordPress sites. Nothing is worse than seeing your site hacked or corrupted due to an attack.

In this comprehensive guide, we‘re going to dig deep on two of the most vital security headers for protecting WordPress – X-Frame-Options and HTTPOnly cookies.

I‘ll share my insights as a data analyst and GPT expert on how these headers work, why they‘re critical for security, and the best ways to implement them in WordPress. We‘ll look at code snippets, plugins, stats and examples so you have all the tools to fully secure your site.

Let‘s dive in!

What is X-Frame-Options and Why Use It?

The X-Frame-Options header prevents clickjacking attacks by controlling whether your WordPress site can be loaded in iframes on other sites.

Clickjacking is a nasty technique attackers use to trick your site visitors into clicking on hidden buttons, links or other elements on your site.

Here‘s how it works:

  1. The attacker loads your website in a transparent iframe on their own malicious website. Your site may be completely invisible to visitors.

  2. They overlay buttons or other interface elements over your iframe‘d site. These buttons appear to do one harmless action, like "Download this free ebook."

  3. But when users click those buttons, they‘re actually clicking on elements in your iframe‘d site, allowing the attacker to perform actions like change settings, post content, transfer money and more.

  4. The victim thinks they‘re clicking a harmless button but are actually getting tricked into clicking disguised buttons on your site through the iframe, letting the attacker execute admin commands or take over accounts.

Devious, isn‘t it?

Some real life examples of clickjacking include:

  • Attackers overlaying a "Play" button on a YouTube video iframe, but when clicked, it actually clicks the Like button, artificially inflating the video‘s likes.

  • Malicious sites overlaying Facebook Like and Share buttons on iframes ofSiteslike, causing users to inadvertently share questionable content.

  • Attackers tricking users into clicking hidden buttons that switch their router admin passwords or change their Gmail forwarding settings by overlaying innocuous buttons on iframes.

How X-Frame-Options prevents clickjacking

The X-Frame-Options header prevents your WordPress site from being loaded in iframes on other sites, foiling these kinds of clickjacking attacks.

There are two options:

  • DENY: Prevents your site from being loaded in any iframe on any other site. This is the most restrictive but secure option.

  • SAMEORIGIN: Only allows your site to be framed on pages from the same origin. This allows trusted sites to embed your content while preventing untrusted third-party sites from framing your site in iframes.

According to cybersecurity researchers, over 4 million websites are vulnerable to clickjacking attacks, so implementing X-Frame-Options is critical for WordPress security.

Key Benefits of Using X-Frame-Options

Here are some of the top reasons why enabling X-Frame-Options is strongly recommended:

  • Prevents clickjacking attacks – This is the #1 reason to use it. Blocks iframe tricks and UI redressing attacks.

  • Stops iframe abuse – Even if it‘s not malicious, you likely don‘t want your site loaded into iframes randomly across the web. This gives you control.

  • Recommended by security experts – OWASP and other leading security groups endorse X-Frame-Options as an effective clickjacking prevention.

  • May enhance SEO – Google has suggested implementing X-Frame-Options to prevent other sites from displaying scraped or duplicated content from your site across the web.

  • Easy to implement – As you‘ll see later, it only takes a few minutes to deploy an X-Frame-Options header in WordPress. Big security win for low effort.

  • Boosts security posture – Adopting security best practices like X-Frame-Options demonstrates your commitment to security to your users.

So in summary, adding this simple header pays big dividends in strengthening the security of your WordPress site and preventing clickjacking attacks.

Real-World X-Frame-Options Stats and Data

Let‘s look at some revealing statistics that demonstrate the importance of using X-Frame-Options:

  • Only 24.9% of the top 1 million websites use X-Frame-Options – This means over 75% of popular sites remain vulnerable to clickjacking. (Source:

  • 92% of websites are vulnerable to UI redressing attacks – These attacks exploit the lack of X-Frame-Options to mask malicious actions behind harmless-looking buttons and graphics overlaid on iframes. (Source: Detectify)

  • Under 1% of the biggest online retailers enable X-Frame-Options – A study by rhinosecurity revealed the vast majority of top ecommerce sites lack this basic clickjacking protection.

  • Sites not implementing best practices like X-Frame-Options see 300% more security incidents – Adopting security headers lowers risk substantially. (Source: IBM Security Services)

These stats make it clear that failure to set the X-Frame-Options header leaves WordPress sites significantly more vulnerable to real-world attacks. This simple fix should be a top priority.

Implementing X-Frame-Options in WordPress

Fortunately, adding the X-Frame-Options header to WordPress is straightforward:

1. Using the .htaccess file

If your WordPress site runs on an Apache web server, you can add the header directive directly to the root .htaccess file:

# Block iframes
Header always set X-Frame-Options "SAMEORIGIN" 


  • Works on any WordPress site hosted on Apache server
  • Easy to implement even on shared hosting with .htaccess access
  • No code changes needed


  • Won‘t work on Nginx or other non-Apache servers
  • Requires access to .htaccess file via FTP/SFTP/cPanel

2. Adding to wp-config.php

You can also add the header directly in wp-config.php:

// Block iframes
header(‘X-Frame-Options: SAMEORIGIN‘);


  • Simple fix that works on any WordPress site
  • Doesn‘t require plugins or .htaccess access


  • Requires ability to modify wp-config.php (some hosts restrict access)

3. Using a security plugin

WordPress security plugins like Wordfence, Sucuri, and iThemes Security allow you to add X-Frame-Options via their security settings:

[Screenshot of X-Frame-Options setting in Wordfence]

Sucuri Security
[Screenshot of Sucuri X-Frame-Options setting]

iThemes Security
[Screenshot of iThemes header configuration]


  • Very easy to enable X-Frame-Options through plugin interface
  • Provides other useful security features


  • Additional plugin to install and maintain
  • Some options limited to premium plugin versions

So in summary, the easiest ways to enable X-Frame-Options in WordPress are by adding it to the .htaccess or wp-config.php files. For a purely admin panel solution, security plugins like Wordfence and Sucuri are great choices.

Testing X-Frame-Options

Once you‘ve implemented X-Frame-Options, validate that it‘s working properly:

  • Use a header checker tool like this one to verify it‘s present.

  • Try loading your site in an iframe on another domain and confirm it‘s blocked.

  • Check your site on to see if X-Frame-Options is configured optimally.

Adding the X-Frame-Options header is one of the easiest and most effective ways to prevent clickjacking attacks on your WordPress site. Combined with other security best practices, it will significantly strengthen your site‘s defenses against real-world threats.

Now let‘s explore another vital security header for WordPress: HTTPOnly cookies.

What are HTTPOnly Cookies and Why Use Them?

The HTTPOnly cookie attribute provides an extra layer of security when enabled.

With HTTPOnly enabled, cookies are only accessible via HTTP requests by the server and cannot be manipulated via JavaScript running in the browser.

This prevents cross-site scripting (XSS) attacks from stealing or modifying protected cookies that have the HTTPOnly flag enabled.

For example, session cookies used to identify logged in WordPress users should always be HTTPOnly to stop XSS vulnerabilities from grabbing cookie values and impersonating users.

Some key benefits of enabling HTTPOnly cookies in WordPress include:

  • Mitigates XSS attacks from stealing or manipulating cookie values
  • Prevents session hijacking by blocking JavaScript cookie access
  • Stops authentication cookies from being read by malicious code
  • Improves login and password security
  • Strongly recommended by OWASP and other security experts for session cookies

HTTPOnly cookies are crucial for securing WordPress against cross-site scripting flaws and cookie theft. Let‘s look at how to implement them.

Implementing HTTPOnly Cookies in WordPress

Here are two straightforward methods to enable HTTPOnly cookies in WordPress:

1. Through wp-config.php

You can force WordPress to use HTTPOnly cookies for all cookies including session cookies by adding this to wp-config.php:

@ini_set(‘session.cookie_httponly‘, true);


  • Quick fix to enable HTTPOnly cookies WordPress-wide
  • No plugins required


  • Requires access to edit wp-config.php (some hosts restrict this)

2. Using a security plugin

Top WordPress security plugins allow you to enable HTTPOnly cookies via their settings:

[Screenshot of Wordfence HTTPOnly cookie setting]

Sucuri Security
[Screenshot of Sucuri HTTPOnly setting]

iThemes Security
[Screenshot of iThemes Force HTTP Only cookie setting]


  • Very easy to enable HTTPOnly cookies through plugin interface
  • Provides other security features


  • Need to install/maintain additional plugin
  • Some options limited to premium plugin versions

So in summary, the best options are to enable HTTPOnly cookies directly through wp-config.php or by using a security plugin like Wordfence or Sucuri if you prefer a pure admin panel approach.

In addition to HTTPOnly, here are some other cookie security best practices for WordPress:

  • Use HTTPS – Transfer cookies only over encrypted HTTPS connections to prevent man-in-the-middle attacks.

  • Short expiration times – Give session cookies a short lifespan so they automatically expire after a few hours or days.

  • Clear unused cookies – Remove unnecessary cookies from old plugins, themes and deprecated features.

  • Limit plugins creating cookies – Reduce attack surface by auditing and restricting which plugins can set cookies.

Following these cookie security guidelines will minimize risks and reinforce your WordPress defenses.

Conclusion and Next Steps

Implementing simple but powerful security headers like X-Frame-Options and HTTPOnly cookies hardens WordPress against very common attacks like clickjacking and cross-site scripting.

Combined with other essential best practices like keeping WordPress updated, using strong passwords, limiting plugins and regular scanning, these headers create a robust security posture.

Here are a few next steps I recommend you take to further lock down WordPress security:

  • Implement additional security headers – Content-Security-Policy, Referrer-Policy and Feature-Policy provide even more protection.

  • Harden user accounts – Use strong passwords, enable 2FA, limit user roles and permissions.

  • Leverage a WAF – Consider a web application firewall like Sucuri or Wordfence for deep threat protection.

  • Conduct regular audits – Continuously test for vulnerabilities using tools like wpscan and brakeman to identify issues early.

  • Monitor for threats – Use a service like Wordfence Threat Defense to detect malware, bots and suspicious activity.

If you have any other questions about securing your WordPress site, let me know! I‘m always happy to help fellow WordPress geeks beef up their site‘s protection.

Let‘s keep our sites safe from the many threats on the web!

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