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Protect your WordPress site from SQL injection

SQL injection is a common attack. This guide explains it in simple words and lists easy ways to keep your WordPress site safe.

SSL and Security2 min read11 steps

What is SQL injection?

A database is the place where your site stores its content, such as posts and user names. SQL is the language used to talk to a database. In an SQL injection attack, a bad person types harmful SQL into a form or a web address. If the site is not careful, it runs that code. The attacker may then read, change or delete your data.

Imagine a librarian who follows every note slipped under the door. That is a site open to injection.

Ways to protect your site

  1. Take a backup first. Save your files and database before you change anything.
  2. Update everything. In the WordPress dashboard, open Dashboard then Updates. Update WordPress, themes and plugins. Most attacks use old, known bugs.
  3. Delete what you do not use. Remove unused plugins and themes in Plugins and Appearance.
  4. Use trusted sources. Install plugins and themes from the official WordPress directory or known makers. Avoid pirated "free" paid themes. They often hide bad code.
  5. Install a security plugin. Many security plugins include a firewall. A firewall is a guard that blocks bad requests before they reach your site.
  6. Use strong passwords. Use long, different passwords for WordPress, cPanel and the database.
  7. Limit user power. Give people the lowest role they need. Few users should be Administrator.
  8. Change the database prefix. By default tables start with wp_. A custom prefix makes guessing a little harder. Only do this on a new site, or with expert help, as it can break an old one.
  9. Keep file permissions correct. Folders are usually 755 and files 644. Do not set anything to 777.
  10. Turn on a server firewall. ModSecurity is a server firewall that blocks many injection tries. Ask Hostvento support if it is on for your plan.
  11. Check your logs. Strange web addresses with words like UNION or SELECT can signal an attack.
Tip: If you think your site was hacked, change all passwords at once and open a ticket at https://secure.hostvento.com/submitticket.php.

Quick recap

  • SQL injection tricks a site into running harmful database commands.
  • Update WordPress, themes and plugins often.
  • Remove unused add-ons and use trusted sources only.
  • Use a firewall, strong passwords and careful user roles.
  • Keep regular backups.