The most critical web app security risks: injection attacks, broken authentication, sensitive data exposure, XML external entities, broken access control, security misconfiguration, XSS, insecure deserialization, vulnerable components, insufficient logging.
Input validation and sanitization, parameterized queries (prevent SQL injection), HTTPS everywhere, secure authentication (bcrypt, JWT), rate limiting, CORS configuration, content security policy headers.
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Regular penetration testing, automated vulnerability scanning, dependency auditing (npm audit, pip-audit), code review focused on security patterns.
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