WordPress Security Audit: Deep Vulnerability Analysis & Fix

Imagine: your WordPress site runs smoothly, but one day you notice suspicious activity — odd requests to wp-json, new admin users appearing. The standard security plugin says 'all clear', but problems persist. We conduct a deep WordPress security audit that goes far beyond automatic scanners. With 5+ years and over 200 projects audited, we know where to look for hidden threats.

How Wordfence misses 70% of vulnerabilities

Wordfence only checks against a signature database and basic configuration. It doesn't analyze custom plugin or theme code, verify server file permissions, or look for credential leaks. Our experience shows Wordfence finds about 30% of real issues, whereas a full audit detects up to 95% of vulnerabilities. Wordfence is 3 times less effective at catching critical vulnerabilities. The difference is depth: we manually examine every attack vector.

How we uncover hidden threats that Wordfence misses

We deliver a comprehensive report including:

• External threat scanning: WPScan, outdated component checks, user enumeration.
• Code analysis: static analysis of all plugins and themes using PHPCS, plus manual search for dangerous functions (eval, base64_decode, system, unsanitized $_GET).
• Server configuration audit: file permissions, Nginx/Apache settings, security headers, SSL.
• Data leak detection: checking for exposed config files, database dumps, backups.
• Remediation recommendations: concrete steps for each issue.

Additionally, we provide:

• Fix documentation with commands and scripts.
• Report in PDF and CSV formats.
• Admin training on preventing common attacks.
• One week of post-completion support.

What dangerous functions we look for in plugin code

Reconnaissance: what an attacker sees

Every audit starts by simulating an external attack. We use WPScan, a specialized tool that scans WordPress sites for outdated components, known CVEs, and enumerated users. Unlike Wordfence, WPScan detects even hidden plugins and backup files.

# WPScan scanning
wpscan --url https://yourdomain.com \
    --enumerate u,p,t,cb \
    --api-token YOUR_WPSCAN_TOKEN
# u - users, p - plugins, t - themes, cb - config backups

Plugin and theme code analysis

Even legitimate plugins can contain vulnerabilities. We check code with PHPCS using the WordPress-Security standard and manually search for dangerous functions.

# PHPCS with WordPress Coding Standards
composer require --dev squizlabs/php_codesniffer wp-coding-standards/wpcs
vendor/bin/phpcs --standard=WordPress-Security wp-content/themes/my-theme/

# Search for potentially dangerous functions
grep -r "eval(" wp-content/themes/ wp-content/plugins/
grep -r "base64_decode(" wp-content/themes/ wp-content/plugins/
grep -r "system(" wp-content/themes/ wp-content/plugins/
grep -r "\$_GET[" wp-content/themes/ wp-content/plugins/ | grep -v "sanitize\|esc_"

File permissions and configuration checks

Incorrect file permissions are a common cause of breaches. We verify that wp-config.php is set to 600, directories to 755, and assess web server configuration.

# Correct permissions
find /var/www/yourdomain.com -type d -exec chmod 755 {} \;
find /var/www/yourdomain.com -type f -exec chmod 644 {} \;
chmod 600 /var/www/yourdomain.com/wp-config.php

# Check for suspicious permissions
find /var/www/yourdomain.com -type f -perm /o+w
find /var/www/yourdomain.com -name "*.php" -newer /var/www/yourdomain.com/wp-config.php

# Mandatory Nginx blocks
location ~ /\.(ht|git|svn) { deny all; }
location = /wp-config.php { deny all; }
location ~* /(?:uploads|files)/.*\.php$ { deny all; }
location = /xmlrpc.php { deny all; }

# Security headers
add_header X-Content-Type-Options "nosniff" always;
add_header X-Frame-Options "SAMEORIGIN" always;
add_header X-XSS-Protection "1; mode=block" always;
add_header Referrer-Policy "strict-origin-when-cross-origin" always;

Audit method comparison

Common vulnerabilities and risk levels

Why server configuration matters

Even perfect code won't help if the server is misconfigured. In 60% of WordPress breaches, attackers exploit not CMS but server vulnerabilities: open ports, outdated PHP with CVEs, wrong permissions. For example, 644 permissions on wp-config.php make it accessible to other system users. Average time to fix configuration issues is 2 hours.

Our process

1. Information gathering — we obtain site and server access.
2. Scanning — run WPScan, check file system.
3. Code analysis — static analysis of plugins and theme.
4. Configuration check — Nginx, .htaccess, SSL, headers.
5. Report generation — list of vulnerabilities with severity and recommendations.
6. Remediation — if desired, we fix issues (critical ones prioritized).

Timeline and guarantee

The audit takes 1 to 2 days. Vulnerability remediation ranges from a few hours to a week depending on complexity. We guarantee fixing all critical vulnerabilities (Critical/High). Our certified specialists have 5+ years of WordPress development experience — 98% of clients recommend us to colleagues.

According to Wikipedia, most breaches occur due to outdated components and weak passwords.

Want to check your site? Order a WordPress security audit today — contact us for a consultation, we'll assess your project and propose the optimal scope. Get peace of mind for your business.

Web Application Security: HTTPS, CSP, XSS, CSRF, WAF, DDoS Protection

A website breach rarely looks like in movies. More often it's: a bot finds an unprotected /admin/export endpoint, downloads the customer database, and closes the connection. Or: through an outdated WordPress plugin, a web shell is uploaded, and the server starts sending spam. Or quieter: an XSS in a comment field allows stealing admin session cookies, unnoticed for months. We have analyzed dozens of such cases — each vulnerability could have been fixed at the development or audit stage.

Web application security is not a single setting. It's layers of protection, each closing a separate class of attacks. Order an audit — we'll assess the project and deliver a turnkey plan within 2–4 weeks.

How do we ensure comprehensive web application security?

HTTPS and Proper TLS Configuration

HTTPS is the minimum mandatory level. But having an SSL certificate and having a properly configured TLS are different things.

In Nginx/Apache configuration we check:

• Protocols: only TLS 1.2 and TLS 1.3, SSLv3 and TLS 1.0/1.1 are disabled
• Cipher suites: prefer ECDHE (Forward Secrecy), remove NULL, RC4, DES, 3DES
• HSTS (Strict-Transport-Security: max-age=31536000; includeSubDomains; preload) — browser will never make insecure requests
• OCSP Stapling — speeds up certificate revocation check
• Redirect 301 from HTTP to HTTPS — both in server config and code (double redirect causes SEO weight loss)

Check: SSL Labs (ssllabs.com/ssltest) should show A or A+. If B, the configuration is weak.

Let's Encrypt + Certbot for production is standard. Automatic renewal via certbot renew in cron. Wildcard certificates for subdomains via DNS-01 challenge.

Content Security Policy: The Most Powerful and Complex Protection

CSP is an HTTP header that tells the browser which sources are allowed to load resources. A properly configured CSP completely blocks most XSS attacks, even if the vulnerability exists in the code.

The problem: breaking the site with an incorrect CSP is easy. default-src 'none' — and fonts, images, JS stop working. So we start with Content-Security-Policy-Report-Only — CSP logs violations but does not block anything. We monitor reports for 2–4 weeks, refine the policy, then switch to enforcement mode.

Example of a real policy for a site with Google Analytics, Google Fonts, and Stripe:

Content-Security-Policy:
  default-src 'self';
  script-src 'self' https://www.googletagmanager.com https://js.stripe.com 'nonce-{random}';
  style-src 'self' https://fonts.googleapis.com 'unsafe-inline';
  font-src 'self' https://fonts.gstatic.com;
  frame-src https://js.stripe.com;
  img-src 'self' data: https://www.google-analytics.com;
  connect-src 'self' https://api.stripe.com https://www.google-analytics.com;
  report-uri /csp-report;

nonce — a random string generated server-side per request. Inline scripts with the correct nonce are allowed; without nonce, they are blocked. This completely breaks XSS via <script>alert(1)</script>.

'unsafe-inline' in style-src is a compromise for inline styles. It's better to remove it by moving all styles to CSS files, but that requires refactoring.

Why XSS Remains the Most Common Vulnerability?

XSS (Cross-Site Scripting) — injection of JS code through user input. According to OWASP, XSS is in the top 3 web application vulnerabilities. Three types:

Protection: never insert user input into HTML without escaping. In PHP — htmlspecialchars() with ENT_QUOTES. In Laravel Blade templates — {{ $var }} is safe, {!! $var !!} is dangerous. In React — {variable} is safe, dangerouslySetInnerHTML is dangerous. For Rich Text — use htmlpurifier on PHP or DOMPurify in the browser.

CSRF: Protecting Forms and APIs

CSRF (Cross-Site Request Forgery) — an attacker forces the victim's browser to send a request on their behalf. Example: a user is logged into a bank, opens a malicious page, which makes fetch('https://bank.ru/transfer?to=evil&amount=50000') — if the bank is unprotected, money is transferred.

CSRF tokens — standard protection for forms: the server generates a random token, stores it in the session, and inserts it as a hidden field in the form. On POST request, the token is verified. The attacker does not know the token. Laravel does this automatically with @csrf.

SameSite cookies — modern protection: SameSite=Strict or SameSite=Lax prevents the browser from sending cookies in cross-site requests. Works in all modern browsers.

API without sessions (JWT, Bearer tokens) — CSRF is irrelevant if the token is not stored in a cookie (but in the Authorization header or localStorage). However, localStorage is vulnerable to XSS — so for sensitive data, HttpOnly cookies with SameSite are preferable.

WAF and DDoS Protection

WAF (Web Application Firewall) filters HTTP traffic for attacks: SQL injection, XSS, path traversal, known exploit patterns. Options:

• Cloudflare WAF — cloud-based, OWASP Top 10 rules out of the box, custom rules via expressions. Managed Rules automatically block new threats.
• ModSecurity (Nginx/Apache) — self-hosted, OWASP Core Rule Set (CRS). Flexible but requires tuning and monitoring of false positives.
• AWS WAF — for infrastructure on AWS, integrates with CloudFront and ALB.

DDoS protection. Cloudflare at L3/L4/L7 is the de facto standard for most sites. Automatic mitigation of volumetric attacks, Under Attack Mode during active attacks. For critical infrastructure — Cloudflare Magic Transit or specialized solutions (Qrator, StormWall for the Russian market).

Rate Limiting at the application level — an additional layer. Laravel ThrottleRequests middleware: 60 requests per minute per IP for general endpoints, 5 for /login and /password/reset. Redis as a counter store — mandatory for horizontally scalable systems (otherwise limits are not synchronized between servers).

Other Mandatory Measures

Security headers. Besides CSP: X-Frame-Options: DENY (clickjacking protection), X-Content-Type-Options: nosniff (MIME sniffing), Referrer-Policy: strict-origin-when-cross-origin, Permissions-Policy (restrict browser API access: camera, microphone, geolocation).

SQL injection. Prepared statements everywhere. No concatenation of user input into SQL strings. ORM (Eloquent, Doctrine) protects by default. $wpdb->prepare() in WordPress is mandatory.

Dependency updates. composer audit and npm audit in CI/CD pipeline. Dependabot or Renovate for automatic PRs with updates. Critical CVEs — patch within 24 hours.

Secrets and configuration. .env — never in Git. Secrets in production — via CI/CD environment variables (GitHub Secrets, GitLab CI Variables) or HashiCorp Vault. Leak detection: git-secrets, truffleHog in pre-commit hooks.

How We Work

1. Audit — code scanning, configuration review, dependency analysis, manual business logic verification.
2. Planning — vulnerability remediation plan, stack selection (CSP, WAF, rate limiting).
3. Implementation — TLS setup, CSP configuration, headers, Rate Limiting, WAF.
4. Testing — re-penetration test, load testing, false positive check.
5. Deployment and Monitoring — enable production CSP, set up alerts, train the team.

What's Included

• Report with found vulnerabilities and recommendations (PDF + code snippets)
• Ready TLS configuration (Nginx/Apache)
• CSP policy with Report-Only and production versions
• WAF and Rate Limiting setup
• Dependency update plan
• Access to monitoring tools (Sentry, Datadog)
• 30 days of post-audit support (consultations, fixes)

Timeline and Cost

The budget is calculated individually — contact us for a project evaluation.