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How to Prevent File Upload Security Issues

Preventing file upload vulnerabilities requires strict validation, server-side controls, and secure configuration. The following points highlight best practices every PHP-based website should follow.

• Strict File Validation: Always validate file type, size, and extension on the server side.
• Disable Script Execution: Uploaded files should be stored in directories where script execution is disabled.
• Rename Uploaded Files: Never trust user-provided file names. Generate safe, random names.
• Use Server-Side MIME Checks: Do not rely on browser-provided file information.
• Apply Least Privilege: Ensure upload directories have minimal permissions.