DIY Website Security Audit: A Step-by-Step Guide
OverMCP Team
TL;DR: How to Do a Security Audit of Your Own Website
A DIY website security audit is a systematic review of your site's code, configuration, and dependencies to identify vulnerabilities. You can do it yourself using free tools like OWASP ZAP, manual code inspection, and dependency checkers. This guide walks you through the exact steps to find and fix the most common security flaws in modern web apps, especially those built with AI coding tools.
What is a DIY Website Security Audit?
A DIY website security audit is the process of checking your own website for security issues without hiring a professional penetration tester. For indie developers and solopreneurs who ship fast with AI coding tools like Cursor, Bolt.new, or Lovable, a DIY audit is essential because these tools often produce code with hidden vulnerabilities like exposed API keys, unsafe SQL queries, or missing authentication checks.
By performing a DIY website security audit, you can catch these problems before they become data breaches. The audit typically involves:
Step 1: Run an Automated Vulnerability Scanner
The quickest way to start your DIY website security audit is to run an automated scanner. These tools crawl your site and test for common vulnerabilities.
Using OWASP ZAP (Free)
ZAP will generate a report with alerts categorized by risk level (High, Medium, Low). Focus on High and Medium alerts first.
Using OverMCP for AI-Code Specific Checks
If your app was built with AI tools, consider using a specialized scanner like OverMCP (overmcp.com) that detects vulnerabilities common in vibe-coded apps, such as hardcoded secrets, insecure database queries, and missing rate limiting.
Step 2: Check for Exposed Secrets in Client-Side Code
One of the most common issues in AI-built apps is accidentally exposing API keys, database URLs, or authentication tokens in the frontend JavaScript.
Manual Check
api_key, secret, password, token, stripe, sk_live, etc.Using a Tool
You can use a tool like Secret Scanner or a simple grep command:
grep -r "sk_live_" .
grep -r "api_key" .
grep -r "password" .Fix
Move all secrets to environment variables on your server or use a secrets manager. Never hardcode secrets in client-side code.
Step 3: Test for Cross-Site Scripting (XSS)
XSS vulnerabilities allow attackers to inject malicious scripts into your web pages. To test:
<script>alert('XSS')</script>Fix
Sanitize all user inputs using libraries like DOMPurify (for HTML) or use framework-specific escaping (e.g., React's {} automatically escapes).
Step 4: Check for SQL Injection
SQL injection can allow attackers to read or modify your database. Test by:
?id=1)?id=1'?id=1' OR '1'='1 — if the page loads differently, likely vulnerableFix
Use parameterized queries (prepared statements) exclusively. Never concatenate user input directly into SQL strings.
Example (Node.js with PostgreSQL):
// Vulnerable
const query = `SELECT * FROM users WHERE id = '${req.params.id}'`;
// Safe
const query = 'SELECT * FROM users WHERE id = $1';
const result = await db.query(query, [req.params.id]);Step 5: Review Authentication and Authorization
Weak Password Policies
Check if your site enforces strong passwords. A common issue in AI-coded apps is allowing passwords like "password123" without any complexity requirements.
Session Management
Missing Authorization Checks
Test if users can access resources they shouldn't by:
/admin/users/5)Step 6: Check HTTPS and Security Headers
HTTPS
Your site must use HTTPS. Use SSL Labs to check your certificate configuration.
Security Headers
Check your HTTP response headers using tools like securityheaders.com. Key headers:
Content-Security-Policy: Controls which resources can be loadedX-Content-Type-Options: Prevents MIME type sniffingX-Frame-Options: Prevents clickjackingStrict-Transport-Security: Enforces HTTPSStep 7: Review Third-Party Dependencies
AI coding tools often pull in many npm packages without careful review. Use npm audit or yarn audit to check for known vulnerabilities:
npm auditUpdate vulnerable packages:
npm updateStep 8: Check for CSRF Vulnerabilities
Cross-Site Request Forgery (CSRF) attacks trick users into performing actions they didn't intend. Test by:
Fix
Use anti-CSRF tokens for all state-changing requests. Most frameworks have built-in support (e.g., Rails, Django, Laravel).
Step 9: Review Logging and Error Handling
Ensure your app doesn't leak sensitive information in error messages. Test by:
Step 10: Automate Regular Audits
A DIY website security audit isn't a one-time task. Set up automated scans:
npm audit on every pushFAQ
How often should I perform a DIY website security audit?
At minimum, run an audit after every major deployment or whenever you add new features. For ongoing safety, automate dependency scanning and use a continuous monitoring tool.
What is the most common vulnerability found in DIY audits?
The most common is exposed secrets (API keys, passwords) in client-side code, especially in apps built with AI coding tools. Next is missing security headers and outdated dependencies.
Can I trust automated scanners alone for a security audit?
No, automated scanners miss logic flaws and business logic vulnerabilities. Always combine automated scanning with manual testing of authentication, authorization, and input validation.