Individual skill
testing-for-xss-vulnerabilities
Tests web applications for reflected, stored, and DOM-based Cross-Site Scripting by injecting JavaScript payloads with Burp Suite (XSS extensions, Active Scan++) and browser tools, then bypassing sanitization and CSP to demonstrate session hijacking and user impersonation. Use for OWASP WSTG client-side injection testing or when evaluating input sanitization and output encoding coverage.
skills/testing-for-xss-vulnerabilities/SKILL.md
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- Last checked
- Nov 9, 2026
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- Repository last updated
- Aug 31, 2026
- License
- Apache-2.0
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- ai-agents Repository topic
- claude-code Repository topic
- cybersecurity Repository topic
- incident-response Repository topic
- mitre-attack Repository topic
- penetration-testing Repository topic
- red-team Repository topic
- security Repository topic
- cloud-security Repository topic
- malware-analysis Repository topic
- xss Declared skill tag
- cross-site-scripting Declared skill tag
- client-side-security Declared skill tag
- owasp-a03 Declared skill tag
- javascript-injection Declared skill tag
- security Derived category
- testing Derived category
- security-application Derived category
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LICENSEasset · 11,255 bytesSKILL.mdcore · 11,611 bytesSKILL.mdcore · 11,611 bytesreferences/api-reference.mddoc · 1,999 bytesscripts/agent.pyruns · 8,640 bytes
Read excerpt
# 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