What is Server-Side Template Injection (SSTI)?

SSTI is a vulnerability where user input is embedded directly into a server-side template engine, allowing attackers to execute arbitrary code on the server.

Which template engines are vulnerable to SSTI?

Popular template engines like Jinja2 (Python), Twig (PHP), FreeMarker (Java), Pebble (Java), and Nunjucks (JavaScript) can all be vulnerable if user input is not properly sanitized.

How do you identify SSTI vulnerabilities?

Look for user input being rendered in templates. Test with mathematical expressions, template-specific syntax (like {{7*7}}), and observe if the output shows evaluated results instead of raw input.

How can SSTI be prevented?

Prevent SSTI by never passing user input directly to template engines, using sandboxed template environments, implementing input validation, and applying the principle of least privilege.

SSTI Vulnerability: Find & Exploit Server-Side Template Injection

SSTI Server Side Template Injection

Deep Dive into Server-Side Template Injection (SSTI)

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