How to Improve WordPress Security (Advanced)

Advanced WordPress Security Techniques

Basic security covers updates, strong passwords, and a security plugin. This guide covers the advanced techniques that separate secure sites from vulnerable ones.

Security Headers

Add these HTTP headers to your server configuration:

Content-Security-Policy: Controls which resources can load (prevents XSS)
X-Content-Type-Options: nosniff: Prevents MIME type sniffing
X-Frame-Options: SAMEORIGIN: Prevents clickjacking
Strict-Transport-Security: Forces HTTPS (HSTS)
Referrer-Policy: strict-origin-when-cross-origin: Controls referrer information
Permissions-Policy: Controls browser feature access (camera, microphone, etc.)

Web Application Firewall (WAF)

A WAF filters malicious traffic before it reaches WordPress. Options:

Cloudflare WAF: Network-level protection with managed rulesets (SiteICO routes all traffic through Cloudflare)
Wordfence: Application-level WAF within WordPress
Sucuri: Cloud-based WAF with DDoS protection

Layer both a network WAF (Cloudflare) and an application WAF (Wordfence) for defense-in-depth.

File Integrity Monitoring

Monitor core WordPress files, themes, and plugins for unauthorized changes. If a file changes outside of a legitimate update, it may indicate compromise. Wordfence and Sucuri include file integrity checkers.

Database Security

Change the default table prefix from wp_
Restrict database user permissions to only what WordPress needs
Disable direct database access from outside the server

SiteICO isolates each site's database in its own MariaDB instance with dedicated credentials, preventing cross-site database access.

Audit Logging

Track who does what on your site. Install WP Activity Log to record logins, content changes, plugin installations, and setting modifications. This is essential for multi-user sites and compliance requirements.

Incident Response Plan

Detect: Monitor uptime, file changes, and traffic anomalies
Contain: Take the site offline or enable maintenance mode
Eradicate: Restore from a clean backup
Recover: Update all credentials, patch the vulnerability, bring site back online
Review: Document the incident and improve defenses

Container Isolation Advantage

Traditional shared hosting means one compromised site can access others on the same server. SiteICO's Docker container isolation ensures each WordPress site runs in its own sandboxed environment with restricted network access, separate file systems, and independent process spaces.