File upload is a high-risk entry point
Uploads can become vectors for malware, storage abuse, and privilege escalation if validation is weak.
Production checklist
- validate MIME type and extension together
- enforce strict file-size and dimension limits
- rename files server-side with random UUIDs
- store outside public path when possible
- run antivirus or scanning queue before publish
- generate signed temporary URLs for access
Additional safeguards
- strip metadata for sensitive image workflows
- deny executable content types by default
- monitor upload anomalies per account/IP
Conclusion
Secure uploads require layered controls from request validation to storage access policy.
