hunt-xxe SKILL.md skillF
hunt-xxe from novaestellar/novahaku is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add novaestellar/novahaku/hunt-xxe@git:20260910.546fe86Pins git:20260910.546fe86 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- F, 15 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- novaestellar/novahaku
- Path
testing/hunt/hunt-xxe/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260910.546fe86, committed Sep 10, 2026
- First version recorded
- Sep 3, 2026
- Size
- 23,074 bytes
- Repository stars
- 28
- License
- MIT
Hunting skill for xxe vulnerabilities. Built from 10 public bug bounty reports including SVG-upload XXE, Office-doc (PPTX/DOCX) XXE, SOAP XXE, SAML AssertionConsumer XXE, blind OOB XXE via DTD callback, parameter-entity XXE, XXE-to-LFI, XXE-to-SSRF, and XXE-to-RCE chains (Adobe Commerce CosmicSting CVE-2024-34102). Use when hunting XXE on any target — emphasis on OOB-Or-It-Didn't-Happen Gate for blind cases.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
## Crown Jewel Targets XXE is a critical-severity vulnerability that consistently pays at the top of bug bounty scales ($5,000–$30,000+) due to its direct path to sensitive data exfiltration and SSRF. Highest-value targets: - **Large enterprise platforms** with XML-heavy backend integrations (finance, logistics, ride-sharing APIs) - **Domains with file-read capability** — `/etc/passwd`, `/etc/shadow`, internal config files, AWS metadata endpoints - **Subdomains sharing backend infrastructure** — one XXE endpoint can pivot to internal services across dozens of domains (as demonstrated by 26+ Uber domains via a single entry point) - **API gateways** accepting XML content types — especially REST APIs that silently accept `Content-Type: application/xml` - **File upload features** — SVG, DOCX, XLSX, PDF, PPTX parsers on the server side - **SAML/SSO endpoints** — SAML assertions are XML-based and frequently vulnerable - **Office/document processing services** — any feature that converts or processes user-supplied documents --- ## Attack Surface Signals ### URL Patterns ``` /api/v*/xml /upload /import /parse /convert /saml/acs /sso/saml /feed /rss /sitemap /webdav /soap/* /wsdl …
Read the whole file at its exact version.
How to install
mdr add novaestellar/novahaku/hunt-xxe@sha256:0b5938f5855e0526The line at the top of this page pins the label git:20260910.546fe86, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_4oefnckzipxlicfv)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Sep 3, 2026 and Sep 10, 2026, about one every 3 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260910.546fe86 latest | 2026-09-10 | 546fe86 | 23,074 B | F | view · diff |
| git:20260903.29924dd | 2026-09-03 | 29924dd | 23,086 B | F | view · diff |
| git:20260903.fa855c4 | 2026-09-03 | fa855c4 | 23,057 B | F | view |
Audit of the latest version
- FAIL, critical: No link to an exfiltration or paste host (matched: http://YOUR.BURPCOLLABORATOR)
- fail: No link to a raw IP address (matched: http://169.254.169.254)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (23074 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No script tag
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
novaestellar/novahaku · 28 stars · license MIT · pushed 2026-09-28 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_4oefnckzipxlicfv GET https://markdownregistry.com/api/v1/resolve?ref=novaestellar/novahaku/hunt-xxe GET https://markdownregistry.com/api/v1/blob/0b5938f5855e05265066503a78cc8232a5a93fb894dee9dacc695bfc63afaa73
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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