Top web vulnerabilities: XSS (Cross-Site Scripting): inject malicious scripts via user input. Prevent: escape/sanitize all output, use Content Security Policy headers. CSRF (Cross-Site Request Forgery): trick users into making unintended requests. Prevent: CSRF tokens, SameSite cookies. SQL Injection: manipulate database queries via input. Prevent: parameterized queries (never concatenate user input into SQL). HTTPS everywhere. Validate all input server-side.
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