WordPress security vulnerabilities explained: common threats and how to fix them

You update a plugin, click “Done”, and move on with your day. But what if that plugin had a known security flaw that attackers were already exploiting?

WordPress powers over 40% of all websites, which naturally makes it a target for attackers. It’s one of the reasons researchers spend time understanding why hackers target WordPress sites in the first place. Every year, thousands of vulnerabilities are discovered across plugins, themes and the wider ecosystem, and attackers often begin scanning for affected websites within hours of a flaw becoming public.

The good news is that most of these issues are preventable. In this guide, I explain how WordPress vulnerabilities happen, the most common threats affecting sites today, and the practical steps you can take to protect your website.

Last reviewed for security accuracy: March 2026

• Over 90% of WordPress vulnerabilities originate from plugins and themes rather than WordPress core
• Attackers often begin scanning for newly disclosed vulnerabilities within hours
• The most common threats include remote code execution, SQL injection, authentication bypass and cross-site scripting
• A layered security approach using a firewall, login protection, file monitoring and backups offers the best protection
• A simple vulnerability checklist can help you audit your site in under 15 minutes

Yes. New WordPress vulnerabilities are discovered regularly as researchers analyse plugins, themes and core code.

Security databases such as Wordfence Intelligence, Patchstack and WPScan track thousands of newly discovered vulnerabilities every year. In many cases, developers release security patches quickly, but attackers often begin scanning for vulnerable websites within hours of public disclosure.

If your site runs WooCommerce, additional protections are important because ecommerce stores often store customer data. These WooCommerce security tips can help reduce common risks.

In practice, most successful attacks do not happen simply because a vulnerability exists. In many cases, the real problem is outdated plugins and abandoned software that never receive security patches.

That is why keeping your WordPress installation updated and running a reliable security plugin with firewall protection is one of the most effective ways to reduce your risk.

Understanding these vulnerabilities is the first step to secure your WordPress site properly.

Security research provides a clear picture of where WordPress vulnerabilities typically come from.

The Wordfence Threat Intelligence reports regularly identify hundreds of newly disclosed vulnerabilities each quarter, many affecting widely used plugins and themes. In some cases, vulnerabilities remain unpatched for weeks or months before developers release fixes.

Plugins represent the largest attack surface. According to research from Patchstack, most critical vulnerabilities discovered each year affect third-party plugins rather than WordPress core.

Examples of recent vulnerabilities include:

• SQL injection vulnerabilities that allow attackers to extract database information
• Authentication bypass flaws that allow attackers to log in as administrators
• Remote code execution vulnerabilities that allow attackers to run malicious code on the server

These are not theoretical risks. Attackers actively scan the internet for vulnerable websites and attempt to exploit them automatically.

Unpatched plugins remain the single biggest security risk for WordPress websites.

When a developer releases a security update, attackers immediately begin scanning for websites that have not installed it yet. If your plugin remains outdated, your site can quickly become a target.

How to fix it:

• Enable automatic updates for plugins where possible so security patches are applied quickly
• Remove any plugins you are no longer using to reduce your attack surface
• Use a Web Application Firewall (WAF) that can apply virtual patches to block exploit attempts even before you install updates

SQL injection allows attackers to manipulate database queries through vulnerable input fields.

If a plugin or theme fails to properly sanitize user input, attackers may gain access to sensitive information stored in your WordPress database.

How to fix it:

• Keep all plugins, themes and WordPress core updated so security patches are applied as soon as they are released
• Use a firewall with SQL injection protection rules. AIOS includes 6G blacklist firewall rules that block common SQL injection patterns before they reach your database
• Change the default WordPress database prefix from wp_ to something unique to make automated SQL injection attacks harder

Brute force attacks attempt thousands of username and password combinations to gain access to your WordPress login page. Attackers often gather targets using automated methods, including techniques that mine WordPress admin email addresses from public sites.

How to fix it:

• Enforce strong passwords for all user accounts
• Enable two-factor authentication (2FA) for every administrator and editor account and implement stronger WordPress login security protections.
• Set login attempt limits to lock out IPs after repeated failures. AIOS lets you configure the exact number of allowed attempts and lockout duration
• Consider renaming your login URL from the default /wp-admin path

XSS vulnerabilities allow attackers to inject malicious scripts into your website. When visitors load the page, the script runs in their browser.

How to fix it:

• Keep themes and plugins updated, as XSS flaws are among the most commonly patched
• Use a content security policy header to restrict which scripts can execute
• Enable your firewall’s XSS protection rules

These vulnerabilities allow attackers to execute arbitrary code on your server.

How to fix it:

• Disable PHP file editing from the WordPress dashboard
• Use file change detection to get notified immediately when core files are modified outside of normal operations
• Set correct file permissions (644 for files, 755 for directories)
• Restrict PHP execution in upload directories

Because new vulnerabilities appear regularly, it helps to follow trusted vulnerability databases.

• Wordfence Intelligence
• Patchstack Vulnerability Database
• WPScan Vulnerability Database
• CVE Details

Security plugins can also monitor your site for suspicious changes and file modifications.

New WordPress vulnerabilities will always appear. That’s simply the reality of running software used by millions of websites.

What separates secure sites from compromised ones usually isn’t luck. It’s good habits.

Keeping plugins and themes updated, running regular backups, and using a security plugin that actively monitors your site can dramatically reduce your risk.

Start with the checklist above and make security checks part of your regular WordPress maintenance routine. If you’d like a more detailed walkthrough, this guide explains how to secure your WordPress site step by step.