testing-for-xss-vulnerabilities

# Testing for XSS Vulnerabilities ## When to Use - Testing web applications for client-side injection vulnerabilities as part of OWASP WSTG testing - Evaluating the effectiveness of input sanitization and output encoding across all application features - Assessing the protection provided by Content Security Policy (CSP) headers against XSS exploitation - Demonstrating the impact of XSS through session hijacking, credential theft, or phishing overlay to stakeholders - Testing single-page applications (React, Angular, Vue) for DOM-based XSS in client-side routing and rendering **Do not use** against applications without written authorization, for deploying persistent XSS payloads that affect real users, or for exfiltrating actual user session tokens from production environments. ## Prerequisites - Authorized scope defining the target web application and acceptable testing activities - Burp Suite Professional with XSS-focused extensions (XSS Validator, Reflector, Active Scan++) - Browser with developer tools and XSS testing extensions (HackBar, XSS Hunter) - XSS Hunter or Burp Collaborator for out-of-band payload verification - SecLists XSS payload lists and custom payloads for WAF bypass scenarios > **Legal Notice:** This skill is for authorized security testing and educational purposes only. Unauthorized use against systems you do not own or have written permission to test is illegal and may violate computer fraud laws. ## Workflow ### Step 1: Input and Output Mapping...