mcp-server-semgrep/semgrep-rules/javascript/monaco-editor/security/audit/monaco-hover-htmlsupport.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: monaco-hover-htmlsupport
  message: >-
    If user input reaches `HoverProvider` while `supportHml` is set to `true` it may introduce an XSS
    vulnerability.
    Do not produce HTML for hovers with dynamically generated input.
  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://github.com/microsoft/monaco-editor/issues/801
    category: security
    technology:
    - monaco
    - monaco-editor
    cwe2022-top25: true
    cwe2021-top25: true
    subcategory:
    - audit
    likelihood: LOW
    impact: LOW
    confidence: LOW
  languages:
  - typescript
  - javascript
  severity: WARNING
  patterns:
  - pattern-either:
    - pattern-inside: |
        import "monaco-editor"
        ...
    - pattern-inside: |
        require("monaco-editor")
        ...
  - pattern-either:
    - pattern: |
        {value: $VAL, supportHtml: true}
    - pattern: |
        {value: $VAL, isTrusted: true}
  - pattern-inside: |
      {range: $R, contents: [...]}
  - pattern-not: |
      {..., value: "...", ...}