Individual skill
web-ssti
Server-Side Template Injection → RCE. Load when user input is rendered by a template engine: profile names in emails, custom reports, "hello {{name}}", error pages echoing math, Jinja2/Twig/Freemarker/Velocity/ERB/Handlebars. Signals: {{7*7}} returns 49, ${...} or #{...} evaluated, framework stack traces mentioning a templating engine.
skills/web/web-ssti/SKILL.md
Source commit ee0e0c50d2f6d941a14b73dd85a2b470d0ab976e
What was checked
- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- No
- Repository scan complete
- No
- Skill scan complete
- Yes
- Observed behavior
- Not checked yet
- Last checked
- Nov 7, 2026
These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.
Install this skill
Choose an agent in your Stack or copy a command below. Commands fetch the pinned commit and copy only this skill directory. Existing destinations are refused. Copying a command does not install anything.
An install command is unavailable: current rules, complete repository and skill scans, an eligible behavior level and a permitted license are required.
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
- ai-agents Repository topic
- ai-security Repository topic
- application-security Repository topic
- blue-team Repository topic
- bug-bounty Repository topic
- claude-code Repository topic
- codex Repository topic
- detection-engineering Repository topic
- gemini Repository topic
- engineering Derived category
Files and excerpt
File metadata and permitted, redacted excerpts come from the recorded scan. Source links are pinned to that commit.
Browse files
SKILL.mdcore · 2,540 bytescheatsheet.mddoc · 3,510 bytesdetection.mddoc · 2,640 bytes
Read excerpt
# Server-Side Template Injection (SSTI)
## When it applies
Input flows into a server-side template that is *evaluated*, not just interpolated as text.
Common in email/notification templates, custom dashboards, and any "use variables in your
message" feature.
## Why it works
Template engines execute expressions. If attacker input becomes part of the template source
(rather than a bound variable), the engine evaluates it — and most engines expose object
introspection that reaches OS command execution.
## Method
> **Payloads & full variation set:** [`cheatsheet.md`](cheatsheet.md) next to this file — work the set, not the first line.