ssti-attacker

ssti-attacker is an agent for Claude Code from morodomi/redteam-skills. It costs 32 tokens per session (1,219 once invoked), scanned A, original, MIT.

A static checker for server-side template injection, a vulnerability where user-controlled text is treated as template code on the server. It covers Blade, Jinja2, Twig, ERB, and EJS patterns.

In plain words
What is it for?
Inspecting Laravel, Flask, Django, Symfony, Ruby on Rails, and Express template code for unsafe rendering patterns.
Why use it?
Putting untrusted input into a template engine can let attackers run unintended template instructions. The checker highlights code patterns that may allow this.

Agent for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Part of the redteam-core plugin — 4 skills, 18 agents shipped together

Good fit Inspecting Laravel, Flask, Django, Symfony, Ruby on Rails, and Express template code for unsafe rendering patterns.

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Install with agentmods
npx agentmods add agents/morodomi/redteam-skills/ssti-attacker
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/morodomi/redteam-skills

Made for: Claude Code.

Or install redteam-core, the plugin that ships this one along with the rest of its 4 skills, 18 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for ssti-attacker

README.md
[![agentmods](https://agentmods.dev/badge/agents/morodomi/redteam-skills/ssti-attacker/github.svg)](https://agentmods.dev/agents/morodomi/redteam-skills/ssti-attacker)
Your own site
<a href="https://agentmods.dev/agents/morodomi/redteam-skills/ssti-attacker"><img src="https://agentmods.dev/badge/agents/morodomi/redteam-skills/ssti-attacker/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for ssti-attacker

Your own site · 80×15
<a href="https://agentmods.dev/agents/morodomi/redteam-skills/ssti-attacker"><img src="https://agentmods.dev/badge/agents/morodomi/redteam-skills/ssti-attacker.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 32 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,219 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00032 $0.01219
Opus 5 $0.00016 $0.00609
Sonnet 5 $0.00006 $0.00244
Haiku 4.5 $0.00003 $0.00122

Measured 9d ago against content hash 0855a122bec5, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

ssti-attacker scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/redteam-core/agents/ssti-attacker.md · 154 lines

How it starts

The opening of the file, as written. The whole thing — 154 lines — stays where its author put it; the contents beside it link to each section on GitHub.

SSTI Attacker

Server-Side Template Injection (SSTI) 脆弱性を静的解析で検出するエージェント。

Detection Targets

Engine Framework Description
Blade Laravel PHPテンプレートエンジン
Jinja2 Flask/Django Pythonテンプレートエンジン
Twig Symfony PHPテンプレートエンジン
ERB Ruby/Rails Rubyテンプレートエンジン
EJS Express Node.jsテンプレートエンジン

Framework Detection Patterns

Framework Vulnerable Pattern Safe Pattern
Laravel Blade::compileString($input) view('template', $data)
Flask render_template_string(input) render_template('file.html')
Django Template(input).render() render(request, 'file.html')
Symfony $twig->createTemplate($input) $twig->render('file.twig')
Ruby ERB.new(input).result erb :template
Express ejs.render(input) res.render('template')

Dangerous Patterns

patterns:
  # PHP/Laravel (Blade)
  - 'Blade::compileString\s*\('
  - 'eval\s*\(\s*Blade::'

  # Python/Flask (Jinja2)
  - 'render_template_string\s*\('
  - 'Environment\s*\(\s*\)\.from_string'

  # Python/Django (Jinja2)
  - 'Template\s*\([^)]*\)\.render'
  - 'Template\s*\(\s*request\.'

  # PHP/Symfony (Twig)
  - 'createTemplate\s*\('
  - '->loadTemplate\s*\(\s*\$'

  # Ruby (ERB)
  - 'ERB\.new\s*\('

  # Node.js/Express (EJS)
  - 'ejs\.render\s*\([^,]+,'
  - 'ejs\.compile\s*\('

Safe Patterns

以下のパターンは誤検知を避けるため除外:

safe_patterns:
  # Laravel - ファイルベース
  - 'view\s*\(\s*["\']'
  - 'View::make\s*\('

  # Flask - ファイルベース
  - 'render_template\s*\(\s*["\']'

  # Django - ファイルベース
  - 'render\s*\(\s*request'

  # Twig - ファイルベース
  - '->render\s*\(\s*["\']'

  # Ruby - シンボル指定
  - 'erb\s+:'

  # Express - ファイルベース
  - 'res\.render\s*\(\s*["\']'

Output Format

{
  "metadata": {
    "scan_id": "<uuid>",
    "scanned_at": "<timestamp>",
    "agent": "ssti-attacker"
  },
  "vulnerabilities": [
    {
      "id": "SSTI-001",
      "type": "blade-ssti",
      "vulnerability_class": "ssti",
      "cwe_id": "CWE-1336",
      "severity": "critical",
      "file": "app/Http/Controllers/TemplateController.php",
      "line": 28,
      "code": "Blade::compileString($request->input('template'))",
      "description": "User input directly passed to Blade::compileString()",
      "remediation": "Use view() with data binding instead of compileString()"
    },
    {
      "id": "SSTI-002",
      "type": "jinja2-ssti",
      "vulnerability_class": "ssti",
      "cwe_id": "CWE-1336",
      "severity": "critical",
      "file": "app/routes.py",
      "line": 15,
      "code": "render_template_string(request.form['template'])",
      "description": "User input directly passed to render_template_string()",
      "remediation": "Use render_template() with a file-based template"
    }
  ],
  "summary": {
    "total": 2,
    "critical": 2,
    "high": 0,
    "medium": 0,
    "low": 0
  }
}

Read the full file on GitHub · 154 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 9d ago First seen · 154 lines · 32 tokens per session scan A 0855a122bec5

Subscribe to this mod's changes

ssti-attacker is an agent published in the GitHub repository morodomi/redteam-skills (2 stars, last pushed 7mo ago), licensed MIT. It adds 32 tokens to every session and 1,219 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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