Remote File Inclusion (RFI) is a vulnerability found in web applications that dynamically include scripts or files based on user input. It allows an attacker to include a remotely hosted file — often…

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Remote File Inclusion (RFI) is a web vulnerability that allows attackers to include malicious files from remote servers into PHP applications. It occurs when user input is passed unsanitized to file inclusion functions like include() or require(). Attackers can exploit this to achieve remote code execution, install web shells, and gain full system control. The vulnerability is commonly found in legacy CMS platforms, custom PHP applications, and systems with dynamic file loading. Prevention involves input validation, whitelisting allowed files, disabling URL includes in PHP configuration, and using proper routing frameworks.

Remote File Inclusion (RFI) — Full Breakdown for Beginners