Joomla Security Hardening Guide: Protect Your Website from Common Attacks
Most Joomla website compromises are preventable. They exploit known weaknesses — default administrator usernames, missing two-factor authentication, unpatched extensions, and misconfigured servers. This guide covers the security measures that actually matter.
For the full security guide covering end-of-life risks, extension security, and hack recovery, see our Joomla Security Hub.
The Top Five Things to Do Now
1. Update everything. Joomla core. Every extension. PHP version. If your Joomla version is end of life, upgrade — no amount of hardening fixes an unsupported CMS.
2. Enable two-factor authentication. Joomla 5 and 6 include built-in 2FA. Enable it for every administrator account. This single measure prevents the majority of brute-force and credential-stuffing attacks.
3. Change the default admin username. If your Super Administrator account is still named "admin," change it today. Automated attack tools target this username specifically.
4. Remove unused extensions. Every installed extension is attack surface. If it is not actively used, uninstall it completely — not just disabled, but removed.
5. Verify your backups work. Having automated backups is essential. But when did you last test restoring one? An untested backup is a hope, not a safety net.
Server-Level Hardening
HTTPS everywhere. SSL/TLS for all pages, enforced through .htaccess or server configuration. No exceptions.
File permissions. Directories: 755. Files: 644. configuration.php: 444. These settings prevent unauthorised file modification.
Administrator directory protection. Add server-level password protection, IP restrictions, or a secret URL parameter to your /administrator directory. This reduces brute-force attempt volume dramatically.
Web Application Firewall. ModSecurity, LiteSpeed WAF, or a cloud-based WAF like Cloudflare provides protection against SQL injection, XSS, and file inclusion attacks at the server level.
Error reporting off. Set Joomla's error reporting to "None" or "System Default" on production sites. "Maximum" displays server paths and configuration details that help attackers.
Ongoing Security
Security is not a one-time configuration. It requires ongoing monitoring, updates, and attention. Our maintenance plans include security monitoring, update management, and backup verification.