Individual skill
hunt-xss
Hunting skill for xss vulnerabilities. Built from 174 public bug bounty reports. Use when hunting xss on any target. For markup injection that reflects raw HTML but does NOT execute JavaScript (no `<script>`/event-handler execution), see hunt-html-injection — escalate here once script execution is possible.
skills/hunt-xss/SKILL.md
Source commit 961a0dd3d2d2f66a07a416ade3b1d4473b64802e
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- Last checked
- Nov 4, 2026
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- Nov 5, 2026
- License
- Apache-2.0
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- ai-agent Repository topic
- appsec Repository topic
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- devsecops Repository topic
- exploit-validation Repository topic
- hermes-agent Repository topic
- infosec Repository topic
- llm-security Repository topic
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- engineering Derived category
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## Autonomous Testing Priority
**Verify reflection before claiming XSS — encoding is everything.**
Your payload must appear in the response body with angle brackets UNESCAPED. `<script>` is XSS. `<script>` is safe encoding — not vulnerable.
**Use a UNIQUE NUMERIC CANARY in your proof payload** — e.g. `<script>alert(91234)</script>` or `"><img src=x onerror=alert(91234)>`. Pick a distinctive 4+ digit number, not `alert(1)`. Practice pages are full of *example* payloads like `alert(1)`/`alert('XSS')` in their hint text; a unique number is how you tell YOUR reflected payload apart from the page's decoy examples. Proof = your `alert(<canary>)` shows up in the response with raw, unescaped angle brackets.
**Try these contexts in order:**
1. **Inline script injection** (works when HTML context allows new tags):
```
<script>alert(CANARY)</script>
```