How is a SQL injection attack defined?

A SQL injection attack is best defined as a code injection technique used to exploit vulnerabilities in data-driven applications. This type of attack allows an attacker to manipulate SQL queries by injecting malicious code into them, which can lead to unauthorized access to data, data manipulation, or even system compromise.

When an application fails to properly sanitize user input, an attacker can insert SQL commands into input fields (such as search boxes or login forms) that the application then executes against its database. By doing so, they can gain access to sensitive information, modify data, or execute administrative operations on the database. Understanding this definition emphasizes the importance of input validation and secure coding practices in preventing such vulnerabilities.