Harden a File Upload Flow

Ticket attachments are accepted from customers and later opened by support agents. The current implementation trusts the extension and public CDN path. Constrain -> rename -> isolate -> scan -> authorize -> serve safely The common trap is to treat extension validation as the upload control. Extension checks are useful, but the uploader controls the filename and the file continues through storage, scanning, preview, download, and browser interpretation. Constrain Allow only the business-required types, cap size, and verify content signatures rather than trusting extension or browser MIME alone. This reduces the parser and storage attack surface before the file enters…

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