mcp-server-semgrep/semgrep-rules/go/lang/security/audit/net/unescaped-data-in-htmlattr.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: unescaped-data-in-htmlattr
  message: >-
    Found a formatted template string passed to 'template.
    HTMLAttr()'. 'template.HTMLAttr()' does not escape contents. Be absolutely sure there is no user-controlled
    data in this template or validate and sanitize the data before passing it into the template.
  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://golang.org/pkg/html/template/#HTMLAttr
    category: security
    technology:
    - go
    confidence: LOW
    cwe2022-top25: true
    cwe2021-top25: true
    subcategory:
    - audit
    likelihood: LOW
    impact: MEDIUM
  languages: [go]
  severity: WARNING
  pattern-either:
  - pattern: template.HTMLAttr($T + $X, ...)
  - pattern: template.HTMLAttr(fmt.$P("...", ...), ...)
  - pattern: |
      $T = "..."
      ...
      $T = $FXN(..., $T, ...)
      ...
      template.HTMLAttr($T, ...)
  - pattern: |
      $T = fmt.$P("...", ...)
      ...
      template.HTMLAttr($T, ...)
  - pattern: |
      $T, $ERR = fmt.$P("...", ...)
      ...
      template.HTMLAttr($T, ...)
  - pattern: |
      $T = $X + $Y
      ...
      template.HTMLAttr($T, ...)
  - pattern: |-
      $T = "..."
      ...
      $OTHER, $ERR = fmt.$P(..., $T, ...)
      ...
      template.HTMLAttr($OTHER, ...)