One-click install
npx skills add https://github.com/SnailSploit/Claude-Red --skill xss-snailsploit
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: xss
Source: https://github.com/SnailSploit/Claude-Red/tree/main/Skills/offensive-xss
Command: npx skills add https://github.com/SnailSploit/Claude-Red --skill xss-snailsploit

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill provides a comprehensive guide to understanding, identifying, exploiting, and mitigating Cross-Site Scripting (XSS) vulnerabilities in web applications.

Core Features & Use Cases

  • XSS Discovery: Learn techniques for finding Stored, Reflected, DOM-based, and Blind XSS.
  • Exploitation: Master payload crafting, context-specific attacks, and bypass techniques for WAFs and CSP.
  • Remediation: Understand modern defense strategies like Sanitizer API, Trusted Types, and strict CSP.
  • Use Case: A security professional can use this Skill to systematically test a web application for XSS flaws, from initial reconnaissance to advanced bypasses and finally recommending secure coding practices.

Quick Start

Use the xss skill to identify potential XSS vulnerabilities in the provided URL by testing common injection points and analyzing the response.

Frequently Asked Questions about xss

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

FAQPage Schema
How do I test for different types of XSS vulnerabilities in a web application?

To test for XSS vulnerabilities, you systematically check common injection points to identify Stored, Reflected, DOM-based, and Blind XSS by analyzing application responses to crafted payloads. This methodology covers reconnaissance through exploitation.

What is the best way to bypass WAF and CSP protections during penetration testing?

Bypassing WAF and CSP protections involves advanced payload crafting and context-specific attacks tailored to the target environment. The methodology provides techniques to evade these security filters and successfully execute cross-site scripting exploits.

How do I mitigate XSS flaws using modern web security strategies?

Mitigate XSS flaws by implementing modern defense strategies including the Sanitizer API, Trusted Types, and strict Content Security Policy configurations. These remediation techniques prevent script execution and secure web applications against injection attacks.

What is Blind XSS and how does it differ from DOM-based XSS?

Blind XSS occurs when malicious payloads execute in a backend or admin panel invisible to the tester, whereas DOM-based XSS executes client-side via modifying the document object model. The methodology covers discovery techniques for both vulnerability types.

Can I use this methodology to perform vulnerability assessment on any web platform?

Yes, this vulnerability assessment methodology applies to any web platform by testing common injection points and analyzing responses. It provides a systematic approach to finding and exploiting cross-site scripting flaws across diverse web environments.

Why does my XSS payload fail to execute even when it is reflected in the page source?

XSS payloads often fail due to input validation filters or strict CSP configurations blocking execution. You must analyze the specific context and apply advanced WAF bypass techniques or adjust the payload crafting to evade these security restrictions.