Understanding how attackers think is the first step to keeping them out. Here's a breakdown of the most common attack vectors against WordPress sites — and exactly what you can do to stop each one.
1. Exploiting Vulnerable Plugins & Themes
This is the #1 cause of WordPress hacks — responsible for over 56% of all successful breaches. Plugins and themes are third-party code that runs with full access to your site. When a security vulnerability is discovered in a popular plugin, it's published in a CVE database — and automated bots start scanning for unpatched sites within hours.
How to stop it: Update plugins and themes promptly, remove deactivated plugins entirely, use a plugin vulnerability scanner, and consider a managed update service that tests updates in staging first.
2. Brute Force Attacks
Bots hammer your login page with thousands of username/password combinations per minute. The WordPress default login at /wp-login.php is well-known, and weak passwords make this devastatingly effective.
How to stop it: Enable two-factor authentication, limit login attempts, change your login URL, use a strong unique password for admin accounts, and implement a WAF that blocks repeat failed logins.
3. SQL Injection
Attackers submit malicious SQL commands through contact forms, search boxes, or URL parameters. A vulnerable input field that isn't properly sanitised can give attackers full access to your database — including all user data and passwords.
How to stop it: Keep WordPress and plugins updated (modern code sanitises inputs), use a WAF that detects and blocks SQL injection patterns, and avoid plugins with poor security track records.
4. Cross-Site Scripting (XSS)
Attackers inject malicious JavaScript into your site — through comments, form fields, or vulnerable plugins. This code then runs in the browsers of your visitors, potentially stealing session cookies or redirecting users to malicious sites.
How to stop it: Use a WAF with XSS protection, ensure plugins sanitise outputs, implement a Content Security Policy (CSP) header, and scan regularly for injected scripts.
5. Backdoors
After gaining initial access, sophisticated attackers plant backdoors — hidden code that lets them re-enter even after you've changed passwords and patched the original vulnerability. Backdoors are often disguised as legitimate WordPress files and are the reason why sites get "re-hacked" after amateur cleanup attempts.
How to stop it: Professional malware removal that includes a full file integrity scan, comparison against clean WordPress core files, and post-cleanup hardening is the only reliable solution.
6. Credential Stuffing
Attackers use lists of username/password combinations leaked from other sites (there are billions of these online). They try these against your WordPress login — and if you reuse passwords, they get in.
How to stop it: Use unique, complex passwords for every account. A password manager makes this painless. Enforce this policy for all admin users, and use 2FA as a second layer.
The Takeaway
Hackers are not targeting you personally. They're running automated tools that scan millions of sites simultaneously looking for known weaknesses. The solution is simple: remove the known weaknesses before they find them. A professional security and maintenance plan does exactly that — systematically, continuously.