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hunt-xss

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Hunting skill for xss vulnerabilities. Built from 174 public bug bounty reports. Use when hunting xss on any target.

redteam/hunt-xss/SKILL.md

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Nov 9, 2026

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MIT

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## When to Use

Use when the target has any endpoint where user input is reflected in HTML output, processed by a JavaScript framework, or stored for later display. XSS is the foundational client-side vulnerability class — it enables session hijacking, data theft, phishing, and account takeover. Every form, search field, URL parameter, file upload, and user-controlled field is a candidate. Highest-value targets: admin panels, OAuth sign-in pages, markdown/wiki renderers, email templates, file upload endpoints (SVG/HTML), and help/documentation sites with looser security posture.

### ⚠<U+FE0F> CRITICAL: Presence ≠ Exploitation

**Reflection of HTML tags does NOT mean XSS is exploitable.** Modern frameworks escape text by default. Before calling a finding XSS, you MUST verify the sink:

| Framework | Default Behavior | XSS Possible Only With |
|-----------|-----------------|----------------------|
| React/JSX | Escapes all text | `dangerouslySetInnerHTML`, `innerHTML` on refs |
| Vue | Escapes `{{ }}` | `v-html` directive |
| Angular | Escapes `{{ }}` | `[innerHTML]` binding |
| Svelte | Escapes `{ }` | `{@html}` tag |
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