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# Common web vulnerabilities to avoid: 1. SQL Injection - Never concatenate user input into SQL - Use parameterized queries / prepared statements 2. Cross-Site Scripting (XSS) - Never inject unescaped user data into HTML - Use context-aware escaping (htmlspecialchars in PHP) 3. CSRF (Cross-Site Request Forgery) - Use CSRF tokens for all state-changing requests - Validate the Origin/Referer header 4. Insecure Direct Object References - Always verify authorization before accessing resources - Don't expose internal IDs directly 5. Sensitive Data Exposure - Always use HTTPS - Never store passwords in plaintext (use bcrypt/argon2) - Never commit secrets to version control
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