Choose layered file-upload controls that address type, storage, scanning, authorization, and serving risk.
The risky convenience A recruiting upload feature accepts resumes from unauthenticated applicants and makes them available to tenant hiring managers within minutes. The file crosses a trust boundary, then lives inside your storage, scanner, previewer, and download path. The framework Constrain -> isolate -> verify before serve Treat upload security as a lifecycle. Decide what is allowed, isolate untrusted bytes, process them safely, then re-authorize every retrieval. No single file signal is trustworthy enough. Layer type validation, private storage, scanning, safe serving, and authorization. Bad instinct Trust the extension and save the original file under a public path. The upload…
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