xss-testing

Inject payloads to detect reflected, stored, and DOM XSS vulnerabilities.

83|8|Updated May 6, 2026
One-click install
npx skills add https://github.com/Q16G/aster --skill xss-testing-q16g
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: xss-testing
Source: https://github.com/Q16G/aster/tree/main/skills/pentest/xss-testing
Command: npx skills add https://github.com/Q16G/aster --skill xss-testing-q16g

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This skill helps security teams identify and validate cross-site scripting (XSS) vulnerabilities by injecting payloads and observing browser execution across reflection, stored, and DOM contexts.

Core Features & Use Cases

  • Black-box XSS testing: Detects whether user inputs can be executed as HTML/JavaScript in the page context.
  • Context-aware payloads: Evaluates HTML content, attributes, JavaScript strings, and URL contexts to map risk.
  • Use Case: Apply to login forms, search fields, comments, and profile pages where user input is echoed or processed, enabling safe remediation planning.

Quick Start

Provide a target web page URL and let the skill analyze input contexts to detect reflected, stored, and DOM XSS vulnerabilities.

Frequently Asked Questions about xss-testing

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

FAQPage Schema
How do I test for XSS vulnerabilities in web forms and search fields?

To test for XSS vulnerabilities, inject controlled payloads into user input fields like forms and search boxes, then observe browser execution across reflection, stored, and DOM contexts to validate risks.

What is the difference between detecting reflected, stored, and DOM XSS?

Detecting reflected, stored, and DOM XSS involves mapping user input execution across different page contexts. Reflected XSS echoes input immediately, stored XSS persists it, and DOM XSS processes it client-side via JavaScript.

How do I validate XSS risks across different HTML and JavaScript contexts?

Validate XSS risks by applying context-aware payloads that evaluate HTML content, attributes, JavaScript strings, and URL contexts, ensuring deterministic testing with controlled inputs and boundary handling.

Can I use XSS testing on profile pages and comment sections where input is echoed?

Yes, you can apply XSS testing to profile pages, comments, and login forms where user input is echoed or processed, enabling safe remediation planning by validating execution risks across these contexts.

What is the best way to document closure verification for suspected XSS vulnerabilities?

The best way to document closure verification is to follow a deterministic workflow that records controlled payloads, boundary handling results, and browser execution observations for confirmed or suspected XSS vulnerabilities.

Why do I need context-aware payloads for web security testing?

You need context-aware payloads for web security testing because user input is processed differently across HTML content, attributes, and JavaScript strings, requiring specific injections to accurately map execution risks.