JavaScript Web Security: Analyzing XSS and Script Injection

Web applications handle sensitive user data daily, making them primary targets for Cross-Site Scripting (XSS) attacks. Understanding how script injection exploits function is critical to building secure, modern web applications. This text-based course guides you through the fundamental mechanics of XSS, demonstrating how unauthorized script tags can read document content and how developers defend against these vulnerabilities. What you'll learn: - Understand the core concepts of Cross-Site Scripting (XSS) and script tag injection - Analyze how JavaScript can access and read sensitive data within the Document Object Model (DOM) - Trace the execution flow of an injection payload on a vulnerable webpage - Study modern mitigation strategies, including Content Security Policy (CSP) headers - Implement secure coding practices like input sanitization and context-aware output encoding Starting with essential security terminology and DOM basics, the course explores injection mechanics through clear written explanations and code examples, concluding with robust defense methodologies. This program is designed for beginner web developers, security enthusiasts, and QA professionals with basic HTML and JavaScript knowledge; no prior security experience is required. Expand your technical skill set and start reading today to build a stronger foundation in web application security.