ssti
Hunt server-side template injection across Jinja2/Twig/Freemarker/Velocity/Handlebars and validate progression from expression injection to code execution.
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- Repository
- BitterSecurity/Decepticon
- Last source activity
- June 2, 2026 at 17:42
- Detected SKILL.md language
- English
- Stars
- 5,611
- Forks
- 1,061
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Source instructions · Read-only preview- name
- ssti
- description
- Hunt server-side template injection across Jinja2/Twig/Freemarker/Velocity/Handlebars and validate progression from expression injection to code execution.
- metadata
- {"subdomain":"web-exploitation","when_to_use":"ssti server side template injection jinja2 twig freemarker velocity handlebars expression code execution"}
# SSTI Playbook
## High-signal checks
- Look for template rendering with user input in `render_template_string`, `Template(...)`, `twig->createTemplate`, `Freemarker Template.process`.
- Confirm user-controlled payload reaches a template context key or template source string.
## Fast probes
- Jinja2: `{{7*7}}`, `{{config}}`, `{{request}}`
- Twig: `{{7*7}}`, `{{_self}}`
- Freemarker: `${7*7}`
- Velocity: `#set($x=7*7)$x`
## Escalation path
1. Detect expression evaluation.
2. Enumerate available objects and filters.
3. Attempt file read / env leak.
4. Attempt command execution via framework-specific gadget chain.
## Validation
Use `validate_finding` with a positive execution signal and a benign negative control.
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