Set strict maximums for both filename length and overall file size.
Do not trust the Content-Type header, as it can be spoofed; instead, inspect the actual file contents to verify its type. fileupload gunner project hot
To mitigate these risks, the project and industry leaders like the OWASP Foundation recommend several "hot" mitigation strategies: Set strict maximums for both filename length and
Uploaded files may contain code designed to infect the system or other users. as it can be spoofed
Automatically rename files upon upload to prevent predictable paths and avoid execution of malicious filenames.
Store uploaded files in a dedicated, isolated directory, ideally outside the web root, and ensure they do not have "execute" permissions. Implementation and Testing