mcp-server-semgrep/semgrep-rules/scala/play/security/twirl-html-var.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: twirl-html-var
  patterns:
  - pattern-either:
    - pattern: |
        @Html($VAL)
    - pattern: |
        @Html(...$VAL + ...)
    - pattern: |
        @Html(... + $VAL...)
  - metavariable-regex:
      metavariable: $VAL
      regex: \w*
  message: >-
    Raw html content controlled by a variable detected. You may be accidentally bypassing secure methods
    of rendering HTML by manually constructing HTML and this could create a cross-site scripting vulnerability,
    which could
    let attackers steal sensitive user data. Try to avoid using `Html()` or consider properly sanitizing
    input data.
  languages: [generic]
  severity: WARNING
  paths:
    include:
    - '*.html'
  metadata:
    category: security
    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://www.playframework.com/documentation/2.8.x/ScalaTemplates#Escaping
    technology:
    - scala
    - play
    - twirl
    confidence: LOW
    cwe2022-top25: true
    cwe2021-top25: true
    subcategory:
    - audit
    likelihood: LOW
    impact: MEDIUM