Because this is a niche community-driven topic, here is a piece structured around the concept of a "Katsem File Upload" as it relates to the viral tech/social media ecosystem: The "Katsem" File Upload Phenomenon
Attackers frequently bypass basic validation by changing a file extension (e.g., renaming a malicious PHP script to malware.jpg ). Relying solely on the file.originalname or the client-supplied Content-Type header is dangerous. katsem file upload