Foundations of Web Security: Defending Against CSRF and XSRF

When users log into web applications, they trust that their sessions are secure. Yet, malicious websites can secretly force browsers to execute unwanted actions on their behalf through Cross-Site Request Forgery (CSRF/XSRF). This text-based course guides you through the mechanics of CSRF attacks, helping you identify vulnerabilities in your web applications and implement robust defenses. You will progress from understanding basic HTTP request behavior to configuring modern security headers and token-based protection systems. What you'll learn: - Understand the foundational concepts of browser-server trust, session cookies, and state management - Analyze how attackers exploit stateful sessions to perform unauthorized actions on behalf of authenticated users - Implement anti-CSRF tokens to validate incoming requests and block malicious payloads - Configure modern SameSite cookie attributes to restrict cross-site credential sharing - Apply defense-in-depth strategies, including custom request headers and double-submit cookie patterns - Evaluate how modern API architectures and token-based authentication impact CSRF vulnerability The course starts with essential web security terminology and browser mechanics before diving into simulated attack scenarios. You will then explore practical, step-by-step defense implementations, exploring both traditional token methods and modern browser-level protections. This course is designed for beginner web developers, security enthusiasts, and software engineers who want to build secure applications from scratch. No prior security experience is required. Read through the core concepts and start securing your web applications against session hijacking today.