Published on Aug 7, 2025 5 min read

2 Reliable Ways to Implement Strong Password Policies in WordPress

Ensuring users create strong passwords is vital for maintaining the security of your WordPress site. Weak passwords make it easier for hackers to exploit vulnerabilities and gain access to sensitive information. By implementing measures to enforce stronger passwords, you can safeguard your site, reduce the risk of breaches, and enhance overall account protection for users.

Why Strong Passwords Matter in WordPress

Before diving into the methods, it’s essential to understand why enforcing strong passwords is crucial:

• Brute-force protection: Strong passwords prevent attackers from easily guessing login credentials.
• User account integrity: Admins, editors, and contributors are all responsible for your site’s health. A compromised account, even at the contributor level, can harm your site.
• Compliance and data protection: Strong password enforcement is a fundamental part of website security policies and data protection practices.

Now, let’s explore the top two methods to ensure that your WordPress users create secure passwords.

Method 1: Use a Security Plugin with Built-In Password Policies

One of the most effective and beginner-friendly ways to enforce strong passwords in WordPress is by using a reputable security plugin that includes password policy features.

Recommended Plugin: iThemes Security

iThemes Security (formerly Better WP Security) is a widely trusted WordPress security plugin with a dedicated option to force strong passwords.

Key Features for Password Enforcement:

• Force strong passwords by user role (e.g., admins, editors).
• Password expiration settings for regular password updates.
• Two-Factor Authentication (optional, but enhances security further).

How to Set Up Strong Password Enforcement Using iThemes Security

1. Install and activate the plugin:

   • Navigate to Plugins > Add New.
   • Search for “iThemes Security”.
   • Click Install Now and then Activate.

2. Configure password policies:

   • Go to Security > Settings.
   • Under the “User Groups” section, click on the settings icon.
   • Select the roles (Admin, Editor, etc.) for which you want to enforce strong passwords.
   • Enable the “Force Strong Passwords” option.

3. Save changes:

   • Click Save Settings to apply the changes.
   • Users in selected roles will now be required to create strong passwords when changing or resetting their passwords.

Advantages of Using a Plugin

• No coding required.
• Offers additional security features such as brute-force protection and file change detection.
• Easy to manage and configure from the dashboard.

This method is especially useful for non-technical users or site owners who prefer not to modify core files or write custom code.

Method 2: Enforce Password Policies Using Custom Code (functions.php)

If you prefer a lightweight, plugin-free approach or have specific password enforcement rules in mind, using custom code can be an efficient solution. You can add a password strength validation script directly to your theme’s functions.php file.

How This Works

This method leverages WordPress’s built-in password strength meter and JavaScript validation to prevent users from setting weak passwords during account creation or when updating their profile.

Sample Code Snippet

Here is a sample code that forces users to use strong passwords:

function enforce_strong_passwords($errors, $update, $user) {
    if ($update) {
        // Existing user profile update
        if (!empty($_POST['pass1']) && wp_check_password_strength($_POST['pass1']) < 3) {
            $errors->add('weak_password', 'Please use a stronger password. Your password must be strong.');
        }
    } else {
        // New user registration
        if (!empty($_POST['user_pass']) && wp_check_password_strength($_POST['user_pass']) < 3) {
            $errors->add('weak_password', 'Please use a stronger password. Your password must be strong.');
        }
    }
    return $errors;
}
add_filter('user_profile_update_errors', 'enforce_strong_passwords', 10, 3);

Note: You might need to create a custom function or use JavaScript to evaluate password strength during the registration process. This method works best when paired with the built-in password strength meter WordPress already provides.

Where to Place This Code

• Log in to your WordPress admin panel using your credentials.
• From the left-hand menu, navigate to Appearance > Theme File Editor. This is where you can directly edit your theme files.
• Locate and open the functions.php file of your active theme. Be cautious when editing this file, as it controls vital functionality for your site.
• Copy the code you wish to add, then paste it at the end of the functions.php file. Double-check the code for any errors to avoid breaking your site.
• Once you’ve added the code, click Update File to save your changes. Before making these edits, consider creating a backup of your site for safety.

Pros of the Custom Code Method

• No plugin dependency — keeps the site lightweight and ensures faster loading times without relying on third-party tools.
• Full control over the enforcement logic — allowing you to implement rules and processes exactly as needed for your project or platform.
• Customizable according to specific needs — offering flexibility to adapt features and functionality to match unique requirements or preferences.

Things to Keep in Mind

• You should have some basic understanding of PHP to avoid errors when editing your theme’s functions.php file. A small mistake can break your site, so proceed carefully.
• Always back up your site before making changes to theme files. This ensures you can quickly restore everything in case something goes wrong during the editing process.
• If you switch themes, remember to migrate this code to the new theme’s functions.php file. Otherwise, the functionality will be lost, and your site may not work as expected.

Educate Users on Creating Strong Passwords

Regardless of the method you choose, it’s always a good idea to educate your users on what makes a password strong to enhance security and protect their accounts. A strong password is difficult for attackers to guess or crack using brute force or common hacking methods. Here are a few detailed guidelines you can share with your users:

• Use a mix of uppercase and lowercase letters to make the password harder to predict.
• Include numbers and special characters (e.g., !, @, #, $) to increase complexity.
• Avoid using dictionary words, names, or common sequences (e.g., “123456,” “password,” or “abc123”), as these are often the first combinations hackers try.
• Aim for at least 12 characters, as longer passwords are significantly more secure and harder to crack than shorter ones.

Consider prominently displaying these tips on registration or profile update pages using a clear message, tooltip, or visual password strength meter. Educating users on these practices helps protect their accounts and builds trust in your platform’s commitment to security.

Conclusion

Securing your WordPress site starts with the basics, and enforcing strong passwords is a critical first step. Whether you prefer using a robust security plugin like iThemes Security or want to implement a custom-coded solution in functions.php, both methods are highly effective.