🔐 Introduction After learning common web vulnerabilities like XSS and CSRF , it is important to understand more critical attacks such as Command Injection (OS Command Injection) . This vulnerability allows an attacker to execute operating system commands directly on the server , which can lead to full system compromise. 💡 What is Command Injection? Command Injection occurs when a web application takes unsafe user input and passes it directly to a system shell or OS command execution function. 👉 If input is not properly validated, attackers can inject malicious system commands. 🧠 How Command Injection Works Imagine a website has a “ping test” feature to check server connectivity. Backend logic example: system("ping -c 4 " + user_input); Normal Input: 8.8.8.8 Result: ping -c 4 8.8.8.8 Malicious Input: 8.8.8.8; whoami Result: ping -c 4 8.8.8.8; whoami 👉 The server executes both commands, exposing system-level information. ⚠️ Common Command Injection Operators Attackers use...