Local File Inclusion
Local File Inclusion (LFI) is a web security vulnerability that allows an attacker to include files on a server through the web browser. This occurs when an application uses user-supplied input to construct file paths without proper validation, enabling access to sensitive files like configuration files, logs, or source code. It can lead to information disclosure, remote code execution, or other attacks if combined with other vulnerabilities.
Developers should learn about LFI to secure web applications by implementing input validation, using allowlists for file paths, and avoiding dynamic file inclusion based on user input. It is critical for roles in cybersecurity, penetration testing, and secure software development, especially when building or auditing PHP, Java, or other server-side applications that handle file operations. Understanding LFI helps prevent data breaches and comply with security standards like OWASP Top 10.