In today’s dynamic digital landscape, file upload functionalities are indispensable for most web applications. From user profile pictures and document sharing platforms to e-commerce product images and CRM attachments, enabling users to upload files enriches user experience and empowers diverse business operations. However, this convenience comes with a significant caveat: file uploads are consistently ranked among the most exploited attack vectors in web application security. Improperly handled, they can open doors to severe vulnerabilities, leading to data breaches, system compromise, and significant reputational damage. This guide delves into the critical aspects of securely handling file uploads, offering best practices to safeguard your web applications.