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offensive-ssti

Dense description covering Server-Side Template Injection across Jinja2, Twig, Freemarker, Velocity, Pebble, Smarty, Mako, Handlebars, ERB, Thymeleaf, EJS, Pug. Engine fingerprinting, filter bypass, blind exploitation, WAF evasion, SSTI-to-RCE chains. Tools: tplmap. CWE-1336. MITRE T1190. Use when testing template rendering endpoints or exploiting template injection for code execution.

Skills/web/offensive-ssti/SKILL.md

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MIT

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# Server-Side Template Injection (SSTI) -- Offensive Methodology

SSTI exists wherever user-controlled input is concatenated into a server-side
template string and the engine evaluates it as code. The engine executes
attacker-supplied directives, granting access to the language runtime and, in
nearly every engine, remote code execution through the host language's object
model. You encounter SSTI in any application passing raw user input to functions
like `render_template_string()`, `Template()`, or `compile()`.

CWE-1336. MITRE ATT&CK T1190.

## Quick Workflow

1. Map injection surfaces: URL params, POST bodies, JSON values, path segments, headers, cookies.