Welcome to your interview.
The question is on your right: Detect Common Web Vulnerability Patterns. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
What are common vulnerabilities found in web applications, and how would you identify them by reviewing request handling code, string construction, and input parsing logic?