mcp-server-semgrep/semgrep-rules/python/django/security/audit/xss/template-var-unescaped-with-safeseq.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: template-var-unescaped-with-safeseq
  message: >-
    Detected a template variable where autoescaping is explicitly
    disabled with '| safeseq' filter. This allows rendering of raw HTML
    in this segment. Ensure no user data is rendered here, otherwise this
    is a cross-site scripting (XSS) vulnerability. If you must do this,
    use `mark_safe` in your 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/3.0/ref/templates/builtins/#safeseq
    category: security
    technology:
    - django
    cwe2022-top25: true
    cwe2021-top25: true
    subcategory:
    - audit
    likelihood: LOW
    impact: MEDIUM
    confidence: LOW
  languages:
  - regex
  paths:
    include:
    - '*.html'
  severity: WARNING
  pattern-regex: '{{.*?\|\s+safeseq(\s+}})?'