What is the definition of code injection?

Code injection is defined as an exploit that introduces malicious code into a program. This typically occurs when an attacker is able to manipulate a program by inserting harmful code through a vulnerable input interface, such as a web form or an API. When the program processes this input, it can execute the injected code, which may lead to unauthorized access, data theft, or system compromise.

This attack method takes advantage of flaws in software, particularly those related to input validation and sanitization. By inserting malicious code, the attacker can alter the program's behavior, leading to serious security breaches. Understanding code injection is essential for developing secure software because it underscores the importance of validating and sanitizing user input to prevent such vulnerabilities.