![]() The following example contains such an HTML form and a server-side script written in PHP. No ValidationĪ simple file upload form typically consists of an HTML form which is presented to the client and a server-side script that processes the file being uploaded. ![]() This article will present eight common flawed methods of securing upload forms, and how easily an attacker could bypass such defenses. Worst still, several web applications contain insecure, unrestricted file upload mechanisms. Naturally, despite the security concerns surrounding the ability for end-users to upload files, it is an increasingly common requirement in modern web applications.įile uploads carry a significant risk that not many are aware of, or how to mitigate against abuses. ![]() Allowing file uploads by end users, especially if done without a full understanding of the risks associated with it, is akin to opening the floodgates for server compromise. ![]()
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