What is the purpose of code reviews in security?

• A. To optimize code performance exclusively.
• B. To identify security flaws, enforce secure coding standards, catch vulnerabilities early, and improve design quality.
• C. To replace automated testing entirely.
• D. To document code for marketing.

Answer: (B)

Code reviews aimed at security focus on catching weaknesses before they can be exploited and on enforcing secure coding practices across the team. A reviewer looks at how data moves through the code, where inputs originate, and how external calls are handled to spot risky patterns. Common targets include input validation gaps, weak authentication and authorization, insecure session management, misuse of cryptography, error handling that reveals too much, and secrets left in the code. By identifying these during review, the team applies secure design decisions early, raises the level of coding standards, and improves overall design quality, which reduces the likelihood of vulnerabilities making it into production.

These reviews are valuable because humans can reason about threat models and real-world scenarios in ways automated checks can’t, and they promote knowledge sharing so developers adopt safer patterns over time. They also complement automated security testing (such as static analysis or fuzzing) rather than replace it, combining contextual judgment with automated verification to strengthen the software’s security posture.

This isn’t about purely optimizing performance, nor is it about replacing automated testing, and it isn’t intended to document code for marketing.