Allowing users to upload files is a staple of modern web applications, from profile pictures to enterprise document management. However, for a security engineer or backend developer, an upload field is essentially an open invitation for an attacker to place an arbitrary binary on your filesystem.
When validation fails, the consequences range from localized data theft to a total Remote Code Execution (RCE) scenario, where an attacker gains a web shell and full control over the host. This article explores why standard defenses often fail and how modern architectural patterns — and their flaws — impact the security posture of your application.
This article has been indexed from DZone Security Zone
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