midWeb Security
How to secure file uploads?
Updated May 6, 2026
Short answer
Validate, sanitize, and restrict file uploads.
Deep explanation
Check MIME type, file size, rename files, and store outside web root.
Real-world example
Preventing malicious PHP uploads.
Common mistakes
- Trusting file extensions.
Follow-up questions
- What is content sniffing?
- How to store uploads safely?