Individual skill
xslt-injection
XSLT injection testing: processor fingerprinting, XXE and document() SSRF, EXSLT write primitives, PHP/Java/.NET extension RCE surfaces. Use when user-controlled XSLT/stylesheet input or transform endpoints are in scope.
skills/xslt-injection/SKILL.md
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# SKILL: XSLT Injection — Testing Playbook
> **AI LOAD INSTRUCTION**: XSLT injection occurs when **attacker-influenced XSLT** is compiled/executed server-side. Map the **processor family** first (Java/.NET/PHP/libxslt). Then chain **document()**, **external entities**, **EXSLT**, or **embedded script/extension functions** per platform. **Authorized testing only**; many payloads are destructive. Routing note: if input is generic XML parsing and may not flow through XSLT, cross-load `xxe-xml-external-entity`; if you care about outbound `document(http:...)` requests, cross-load `ssrf-server-side-request-forgery`.
---
## 0. QUICK START
1. **Find sinks**: parameters named `xslt`, `stylesheet`, `transform`, `template`, SOAP stylesheets, report generators, XML→HTML converters.
2. **Probe reflection**: inject unique namespace or `xsl:value-of select="'marker'"` — if output changes, execution likely.
3. **Fingerprint** processor (§1).
4. **Escalate** by family: **document()** / **XXE** (§2–3), **EXSLT write** (§4), **PHP** (§5), **Java** (§6), **.NET** (§7).
**Quick probe** (harmless marker):