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ssti-server-side-template-injection

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SSTI playbook. Use when template expressions, server-side rendering, preview features, or templating engines may evaluate attacker-controlled content.

skills/ssti-server-side-template-injection/SKILL.md

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# SKILL: Server-Side Template Injection (SSTI) — Expert Attack Playbook

> **AI LOAD INSTRUCTION**: Expert SSTI techniques. Covers polyglot detection probes, engine fingerprinting, Jinja2/FreeMarker/Twig/ERB RCE chains, client-side Angular SSTI, and bypass techniques. Base models often miss sandbox escape MRO chains and non-Jinja2 engines. For PHP CMS template eval, Jira SSTI, Confluence OGNL, and Spring Cloud Gateway SpEL, load the companion [SCENARIOS.md](./SCENARIOS.md).

## 0. RELATED ROUTING

Before using full engine-specific exploitation, you can first load:

- First use the polyglot probe sequence at the top of this file for low-noise fingerprinting
- [expression-language-injection](../expression-language-injection/SKILL.md) when `${7*7}` or `%{7*7}` resolves in Java (SpEL/OGNL) — different attack surface from template engines

### Extended Scenarios

Also load [SCENARIOS.md](./SCENARIOS.md) when you need: