Individual skill
web-xxe
XML External Entity injection → file read, SSRF, sometimes RCE. Load when the app parses XML you supply: SOAP, SAML, XML APIs, SVG/DOCX/XLSX upload, RSS import, `Content-Type: application/xml`. Signals: XML request bodies, "<?xml", SAML responses, file parsers.
skills/web/web-xxe/SKILL.md
Source commit ee0e0c50d2f6d941a14b73dd85a2b470d0ab976e
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- Observed behavior
- Not checked yet
- Last checked
- Nov 7, 2026
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Repository context
- Repository stars (not skill ratings)
- 27
- Repository last updated
- Oct 14, 2026
- License
- MIT
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- agent-skills Repository topic
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SKILL.mdcore · 2,328 bytescheatsheet.mddoc · 2,668 bytesdetection.mddoc · 2,925 bytes
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# XML External Entity (XXE)
## When it applies
The server parses attacker-supplied XML with external entities enabled. Any XML sink counts —
SOAP, SAML, REST-with-XML, and file formats that are XML underneath (SVG, DOCX, XLSX).
## Why it works
XML DTDs can declare entities that the parser resolves — including `SYSTEM` entities that read
local files or fetch URLs. If the parser doesn't disable external entities (the insecure
default in many libs), your entity is expanded server-side.
## Method
> **Payloads & full variation set:** [`cheatsheet.md`](cheatsheet.md) next to this file — work the set, not the first line.
1. **Detect**: inject a DOCTYPE with an external entity and reference it: