python.django.security.audit.xss.template-autoescape-off.template-autoescape-off

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Detected a template block where autoescaping is explicitly disabled with '{% autoescape off %}'. This allows rendering of raw HTML in this segment. Turn autoescaping on to prevent cross-site scripting (XSS). If you must do this, consider instead, using mark_safe in Python code.

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Defintion

rules:
  - id: template-autoescape-off
    message: Detected a template block where autoescaping is explicitly disabled
      with '{% autoescape off %}'. This allows rendering of raw HTML in this
      segment. Turn autoescaping on to prevent cross-site scripting (XSS). If
      you must do this, consider instead, using `mark_safe` in Python code.
    metadata:
      cwe:
        - "CWE-79: Improper Neutralization of Input During Web Page Generation
          ('Cross-site Scripting')"
      owasp:
        - A07:2017 - Cross-Site Scripting (XSS)
        - A03:2021 - Injection
      references:
        - https://docs.djangoproject.com/en/3.1/ref/templates/builtins/#autoescape
      category: security
      technology:
        - django
      cwe2022-top25: true
      cwe2021-top25: true
      subcategory:
        - audit
      likelihood: LOW
      impact: MEDIUM
      confidence: LOW
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
    languages:
      - regex
    paths:
      include:
        - "*.html"
    severity: WARNING
    pattern-regex: "{%\\s+autoescape\\s+off\\s+%}"

Examples

template-autoescape-off.html

<h4>From: {{ from_email }}</h4>
<h4>To:
    {% for recipient in recipients %}
    {{ recipient }}&nbsp;
    {% endfor %}
</h4>
<h4>Subject: {{subject}}</h4>
<div class="email-html" style="display: block;">
    <!-- ruleid: template-autoescape-off -->
    {% autoescape off %}
    {{ html_message }}
    {% endautoescape %}
</div>
<div class="email-text" style="display: none;">
    <pre>{{ body }}</pre>
</div>
<hr>