Overview
Basic Unrestricted File Upload focuses on an image upload feature that does not sufficiently validate the uploaded content or file type.
This lab introduces the core upload security problem: user-supplied files become dangerous when applications trust names, extensions, MIME headers, or storage locations without enforcing safe handling.
Security Impact
Unrestricted upload can lead to malicious content storage, application defacement, server-side execution risk, malware hosting, or abuse of trusted domains to distribute unsafe files.
Vulnerability Scope
Profile image uploads, support attachments, document portals, CMS media libraries, and product image features all share the same risk: untrusted files cross into application-controlled storage.
Lab Focus
The lab focuses on upload validation as a layered problem: accepted types, content handling, storage isolation, and preventing uploaded files from becoming executable.
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