Definition
A SQL injection, or SQLi, is a type of cyberattack where malicious SQL code is inserted into data input fields. This allows attackers to manipulate a web application's database, potentially gaining unauthorized access to sensitive information or altering data. Attackers exploit vulnerabilities in how applications handle user input, often by submitting crafted commands instead of expected data. Understanding SQL injection is crucial for developers and security professionals to prevent data breaches and maintain system integrity. For instance, an attacker might input ' OR '1'='1' into a username field to bypass authentication. Unlike denial of service attacks that aim to disrupt service, SQL injection focuses on data compromise. This topic is frequently covered on CompTIA Security+, CySA+, and CISSP certification exams.