Individual skill
hunt-xxe
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.
knowledge/Claude-BugHunter/skills/hunt-xxe/SKILL.md
Source commit 961a0dd3d2d2f66a07a416ade3b1d4473b64802e
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- Matches the observed repository HEAD
- Yes
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- No
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- Skill scan complete
- No
- Observed behavior
- Not checked yet
- Last checked
- Nov 4, 2026
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- Repository stars (not skill ratings)
- 1,013
- Repository last updated
- Nov 5, 2026
- License
- Apache-2.0
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- ai-agent Repository topic
- appsec Repository topic
- bug-bounty Repository topic
- cybersecurity Repository topic
- devsecops Repository topic
- exploit-validation Repository topic
- hermes-agent Repository topic
- infosec Repository topic
- llm-security Repository topic
- nuclei Repository topic
- engineering Derived category
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## 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
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