Secure File Uploads in Laravel: Validation, Storage & Basic Virus Protection

Security is not a product, but a process.- Bruce Schneier, Security Technologist File uploads are a common requirement in modern web applications - whether it's profile pictures, documents, invoices, or media files. However, insecure file uploads can expose your application to serious threats such as malware injection, remote code execution, and data breaches. Key Takeaway Validate both file extension (mimes) and content-based MIME type (mimetypes) - never trust one alone. Always generate a random UUID-based filename - never persist client-supplied filenames to disk. Store files outside the public directory on a private disk; serve through authenticated controllers. Use temporary signed URLs for file downloads to prevent unauthorized access and link sharing. Integrate ClamAV or another AV engine; fail closed if the scanner is unavailable. Strip EXIF metadata from images to protect user privacy and prevent location data leaks. Table of Contents Introduction Understanding File Upload Ris