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Cross-Site Scripting and HTML Injection Testing

Detect stored, reflected, and DOM-based XSS and HTML injection vulnerabilities in web applications.

Updated Mar 2, 2026
Search Tags:#xss#vulnerability assessment#security testing#penetration testing#web application security#html injection
One-click install
npx skills add https://github.com/vitoropereira/claude-starter-kit --skill cross-site-scripting-and-html-injection-testing-vitoropereira
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: Cross-Site Scripting and HTML Injection Testing
Source: https://github.com/vitoropereira/claude-starter-kit/tree/main/.claude/skills/security/xss-html-injection
Command: npx skills add https://github.com/vitoropereira/claude-starter-kit --skill cross-site-scripting-and-html-injection-testing-vitoropereira

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill addresses the critical security need to identify and test for Cross-Site Scripting (XSS) and HTML Injection vulnerabilities in web applications, preventing potential data breaches and unauthorized access.

Core Features & Use Cases

  • Vulnerability Detection: Systematically identifies input reflection points and tests for various XSS and HTML injection vectors.
  • Exploitation Techniques: Demonstrates methods for stealing cookies, hijacking sessions, and injecting malicious content.
  • Use Case: A security analyst can use this skill to thoroughly assess a web application for client-side injection flaws before deployment, ensuring robust security.

Quick Start

Use the xss-html-injection skill to test for XSS vulnerabilities on the provided target URL.

Frequently Asked Questions about Cross-Site Scripting and HTML Injection Testing

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I test web applications for Cross-Site Scripting and HTML injection vulnerabilities?▼

To test for Cross-Site Scripting and HTML injection, you systematically identify input reflection points and craft payloads to detect stored, reflected, and DOM-based attack vectors across the target URL.

What is the difference between stored, reflected, and DOM-based XSS testing?▼

XSS testing covers stored injections persisted in databases, reflected payloads bounced via HTTP responses, and DOM-based flaws executed client-side through JavaScript, requiring tailored payload crafting for each vector.

How can I bypass XSS filters during penetration testing?▼

Bypassing XSS filters involves crafting specialized payloads that evade client-side and server-side sanitization, targeting input reflection points with encoding variations and JavaScript execution techniques.

Do I need to know JavaScript and HTTP to perform HTML injection assessments?▼

Yes, understanding JavaScript, HTML, and HTTP is required to perform HTML injection assessments, as you must analyze client-side execution and manipulate HTTP requests to exploit vulnerabilities.

Can XSS exploitation be used for session hijacking?▼

Yes, XSS exploitation can be used for session hijacking by injecting malicious JavaScript payloads designed to steal cookies and unauthorizedly access user sessions in web applications.

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