mcp-server-semgrep/semgrep-rules/go/template/security/insecure-types.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: go-insecure-templates
  patterns:
  - pattern-inside: |
      import "html/template"
      ...
  - pattern-either:
    - pattern: var $VAR template.HTML = $EXP
    - pattern: var $VAR template.CSS = $EXP
    - pattern: var $VAR template.HTMLAttr = $EXP
    - pattern: var $VAR template.JS = $EXP
    - pattern: var $VAR template.JSStr = $EXP
    - pattern: var $VAR template.Srcset = $EXP
  message: >-
    usage of insecure template types. They are documented as a security risk. See https://golang.org/pkg/html/template/#HTML.
  severity: WARNING
  metadata:
    cwe:
    - "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"
    references:
    - https://golang.org/pkg/html/template/#HTML
    - https://twitter.com/empijei/status/1275177219011350528
    category: security
    technology:
    - template
    confidence: LOW
    owasp:
    - A07:2017 - Cross-Site Scripting (XSS)
    - A03:2021 - Injection
    cwe2022-top25: true
    cwe2021-top25: true
    subcategory:
    - audit
    likelihood: LOW
    impact: MEDIUM
  languages:
  - go