File upload security tests with coding agents

File upload security testing should validate the entire lifecycle from multipart request handling and temporary storage through validation, transformation, permanent object storage, and authorized retrieval, especially after coding-agent changes that may alter MIME support, permissions, validation order, or URL exposure. Following OWASP defense-in-depth guidance, tests should cover extension and content-type checks, file signatures, generated filenames, size and processing limits, storage outside public web roots, malware scanning, cleanup of rejected uploads, and edge cases such as Unicode names, duplicate names, malformed documents, archives, and boundary-size files. Accepted uploads should use server-generated keys and be protected from path traversal, cross-tenant access, overwrites, public residual objects, and unsafe browser interpretation of active file formats. Teams should give coding agents explicit policies and existing test entry points, require tests for authorization and cleanup rather than response codes alone, and run fixtures in isolated storage while ensuring prohibited uploads fail without leaving retrievable artifacts and permitted files remain accessible only to authorized users.

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