Cross-Site Scripting and HTML Injection Testing

Execute comprehensive client-side injection vulnerability assessments on web applications to identify XSS and HTML injection flaws, demonstrate exploitation techniques for session hijacking and credential theft, and validate input sanitization and output encoding mechanisms. This skill enables systematic detection and exploitation across stored, reflected, and DOM-based attack vectors. Locate areas where user input is reflected in responses: Insert test strings to observe application behavior: Monitor for: Stored XSS Indicators: Reflected XSS Indicators: DOM-Based XSS Indicators: Target areas with persistent user content: Build URLs containing XSS payloads: Techniques for delivering reflected XSS to victims: Locate JavaScript functions that process user input: Locate where user-controlled data enters the application: Modify page appearance without JavaScript: Persistent content manipulation: Scenario : Blog comment feature vulnerable to stored XSS Detection : Observation : Comment renders and script executes for all viewers Exploitation Payload : Result : Every user viewing the comment has their session cookie sent to attacker's server. Scenario : Search results page reflects query without encoding Vulnerable URL : Detection Test : Crafted Attack URL : Delivery : URL sent via phishing email to target user. Scenario : JavaScript reads URL hash and inserts into DOM Vulnerable...