mcp-server-semgrep/semgrep-rules/python/django/security/injection/email/xss-html-email-body.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: xss-html-email-body
  message: >-
    Found request data in an EmailMessage that is set to use HTML.
    This is dangerous because HTML emails are susceptible to XSS.
    An attacker could inject data into this HTML email, causing XSS.
  metadata:
    cwe:
    - "CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')"
    owasp:
    - A03:2021 - Injection
    references:
    - https://www.damonkohler.com/2008/12/email-injection.html
    category: security
    technology:
    - django
    subcategory:
    - vuln
    likelihood: MEDIUM
    impact: MEDIUM
    confidence: MEDIUM
  languages: [python]
  severity: WARNING
  patterns:
  - pattern-inside: |
      def $FUNC(...):
        ...
        $EMAIL.content_subtype = "html"
        ...
  - pattern-either:
    - pattern: django.core.mail.EmailMessage($SUBJ, request.$W.get(...), ...)
    - pattern: |
        $DATA = request.$W.get(...)
        ...
        django.core.mail.EmailMessage($SUBJ, $DATA, ...)
    - pattern: |
        $DATA = request.$W.get(...)
        ...
        $INTERM = $DATA
        ...
        django.core.mail.EmailMessage($SUBJ, $INTERM, ...)
    - pattern: |
        $DATA = request.$W.get(...)
        ...
        django.core.mail.EmailMessage($SUBJ, $B.$C(..., $DATA, ...), ...)
    - pattern: |
        $DATA = request.$W.get(...)
        ...
        $INTERM = $B.$C(..., $DATA, ...)
        ...
        django.core.mail.EmailMessage($SUBJ, $INTERM, ...)
    - pattern: |
        $DATA = request.$W.get(...)
        ...
        django.core.mail.EmailMessage($SUBJ, $STR % $DATA, ...)
    - pattern: |
        $DATA = request.$W.get(...)
        ...
        $INTERM = $STR % $DATA
        ...
        django.core.mail.EmailMessage($SUBJ, $INTERM, ...)
    - pattern: |
        $DATA = request.$W.get(...)
        ...
        django.core.mail.EmailMessage($SUBJ, f"...{$DATA}...", ...)
    - pattern: |
        $DATA = request.$W.get(...)
        ...
        $INTERM = f"...{$DATA}..."
        ...
        django.core.mail.EmailMessage($SUBJ, $INTERM, ...)
    - pattern: $A = django.core.mail.EmailMessage($SUBJ, request.$W.get(...), ...)
    - pattern: return django.core.mail.EmailMessage($SUBJ, request.$W.get(...), ...)
    - pattern: django.core.mail.EmailMessage($SUBJ, request.$W(...), ...)
    - pattern: |
        $DATA = request.$W(...)
        ...
        django.core.mail.EmailMessage($SUBJ, $DATA, ...)
    - pattern: |
        $DATA = request.$W(...)
        ...
        $INTERM = $DATA
        ...
        django.core.mail.EmailMessage($SUBJ, $INTERM, ...)
    - pattern: |
        $DATA = request.$W(...)
        ...
        django.core.mail.EmailMessage($SUBJ, $B.$C(..., $DATA, ...), ...)
    - pattern: |
        $DATA = request.$W(...)
        ...
        $INTERM = $B.$C(..., $DATA, ...)
        ...
        django.core.mail.EmailMessage($SUBJ, $INTERM, ...)
    - pattern: |
        $DATA = request.$W(...)
        ...
        django.core.mail.EmailMessage($SUBJ, $STR % $DATA, ...)
    - pattern: |
        $DATA = request.$W(...)
        ...
        $INTERM = $STR % $DATA
        ...
        django.core.mail.EmailMessage($SUBJ, $INTERM, ...)
    - pattern: |
        $DATA = request.$W(...)
        ...
        django.core.mail.EmailMessage($SUBJ, f"...{$DATA}...", ...)
    - pattern: |
        $DATA = request.$W(...)
        ...
        $INTERM = f"...{$DATA}..."
        ...
        django.core.mail.EmailMessage($SUBJ, $INTERM, ...)
    - pattern: $A = django.core.mail.EmailMessage($SUBJ, request.$W(...), ...)
    - pattern: return django.core.mail.EmailMessage($SUBJ, request.$W(...), ...)
    - pattern: django.core.mail.EmailMessage($SUBJ, request.$W[...], ...)
    - pattern: |
        $DATA = request.$W[...]
        ...
        django.core.mail.EmailMessage($SUBJ, $DATA, ...)
    - pattern: |
        $DATA = request.$W[...]
        ...
        $INTERM = $DATA
        ...
        django.core.mail.EmailMessage($SUBJ, $INTERM, ...)
    - pattern: |
        $DATA = request.$W[...]
        ...
        django.core.mail.EmailMessage($SUBJ, $B.$C(..., $DATA, ...), ...)
    - pattern: |
        $DATA = request.$W[...]
        ...
        $INTERM = $B.$C(..., $DATA, ...)
        ...
        django.core.mail.EmailMessage($SUBJ, $INTERM, ...)
    - pattern: |
        $DATA = request.$W[...]
        ...
        django.core.mail.EmailMessage($SUBJ, $STR % $DATA, ...)
    - pattern: |
        $DATA = request.$W[...]
        ...
        $INTERM = $STR % $DATA
        ...
        django.core.mail.EmailMessage($SUBJ, $INTERM, ...)
    - pattern: |
        $DATA = request.$W[...]
        ...
        django.core.mail.EmailMessage($SUBJ, f"...{$DATA}...", ...)
    - pattern: |
        $DATA = request.$W[...]
        ...
        $INTERM = f"...{$DATA}..."
        ...
        django.core.mail.EmailMessage($SUBJ, $INTERM, ...)
    - pattern: $A = django.core.mail.EmailMessage($SUBJ, request.$W[...], ...)
    - pattern: return django.core.mail.EmailMessage($SUBJ, request.$W[...], ...)
    - pattern: django.core.mail.EmailMessage($SUBJ, request.$W, ...)
    - pattern: |
        $DATA = request.$W
        ...
        django.core.mail.EmailMessage($SUBJ, $DATA, ...)
    - pattern: |
        $DATA = request.$W
        ...
        $INTERM = $DATA
        ...
        django.core.mail.EmailMessage($SUBJ, $INTERM, ...)
    - pattern: |
        $DATA = request.$W
        ...
        django.core.mail.EmailMessage($SUBJ, $B.$C(..., $DATA, ...), ...)
    - pattern: |
        $DATA = request.$W
        ...
        $INTERM = $B.$C(..., $DATA, ...)
        ...
        django.core.mail.EmailMessage($SUBJ, $INTERM, ...)
    - pattern: |
        $DATA = request.$W
        ...
        django.core.mail.EmailMessage($SUBJ, $STR % $DATA, ...)
    - pattern: |
        $DATA = request.$W
        ...
        $INTERM = $STR % $DATA
        ...
        django.core.mail.EmailMessage($SUBJ, $INTERM, ...)
    - pattern: |
        $DATA = request.$W
        ...
        django.core.mail.EmailMessage($SUBJ, f"...{$DATA}...", ...)
    - pattern: |
        $DATA = request.$W
        ...
        $INTERM = f"...{$DATA}..."
        ...
        django.core.mail.EmailMessage($SUBJ, $INTERM, ...)
    - pattern: $A = django.core.mail.EmailMessage($SUBJ, request.$W, ...)
    - pattern: return django.core.mail.EmailMessage($SUBJ, request.$W, ...)