Easy $300: Template Injection

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In this blog, I’ll walk you through Template Injection, a critical web vulnerability that can lead to data theft, remote code execution, and even complete system control! 😱 I awarded $300 💵 to a security researcher for responsibly reporting this issue, so if you’re into bug hunting, this could be an easy catch for you too! 🎣

Created by Copilot

Template Injection occurs when an attacker injects malicious code into a web application’s template engine. This happens because user input is not properly sanitized, allowing an attacker to manipulate the template system and execute arbitrary commands.

Let’s focus on Jinja2, one of the most widely used template engines in Python.

Jinja2 uses:

{{ }} for expressions (values){% %} for statements (logic flow)<html>
<body>
<h1>{{ list_title }}</h1>
<h2>{{ list_description }}</h2>
{% for item in item_list %}
{{ item }}{% if not loop.last %}, {% endif %}
{% endfor %}
</body>
</html>from jinja2 import Templatewith open('example.jinja') as f:
tmpl = Template(f.read())print(tmpl.render(
list_title="Chapter Contents",
list_description="Here are the contents of chapter 16."…

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