Overview
DOM-Based XSS focuses on a calculation-style page where browser-side JavaScript handles user-controlled input.
This lab shifts the XSS discussion from server responses to client-side data flow, where JavaScript sources, DOM sinks, and browser rendering behavior can create risk even when the server response looks static.
Security Impact
DOM-based XSS can expose users to browser-side code execution through client-side logic. The risk is especially relevant to single-page apps, embedded widgets, front-end routing, session workflows, and dynamic interfaces.
Vulnerability Scope
Calculators, search filters, front-end routers, URL fragment handlers, dashboard widgets, and JavaScript-heavy pages become exposed when user-controlled data is written into the DOM.
Lab Focus
The lab focuses on tracing data through client-side JavaScript, identifying unsafe DOM updates, and understanding why browser-side context matters as much as server-side output encoding.
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