Web Security Fundamentals: Injection Attacks and Session Defense

Modern web applications face constant threats from attackers seeking to exploit code vulnerabilities and hijack user sessions. Understanding these security gaps is the first step toward writing resilient, secure code. In this text-only course, you will explore the foundational principles of web security, focusing on common injection vectors, transport security, and cookie-based session protection. You will learn to think like a defender, identifying weaknesses in application logic and applying industry-standard mitigations. What you'll learn: • Understand the mechanics of various injection vulnerabilities and how malicious data compromises systems. • Configure secure cookie attributes, including HTTPOnly, Secure, and SameSite, to prevent session hijacking. • Explain the role of HTTPS and transport layer security in defending against man-in-the-middle attacks. • Implement modern security headers, such as Content Security Policy (CSP), to restrict unauthorized scripts. • Apply secure coding practices and input validation techniques to neutralize injection risks. • Practice analyzing vulnerable code patterns and applying secure refactoring strategies through written exercises. This course begins with essential security definitions and core web protocols, establishing a solid foundation before moving into practical injection vectors and transport security. You will progress through real-world scenarios, learning how to secure session cookies, enforce HTTPS, and apply modern defensive headers. Designed for beginner developers, software engineering students, and tech enthusiasts looking to build a strong foundation in web security, this course requires no prior cybersecurity experience. Start reading today to build safer, more resilient web applications.