mcp-server-semgrep/semgrep-rules/javascript/browser/security/wildcard-postmessage-configuration.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: wildcard-postmessage-configuration
  message: >-
    The target origin of the window.postMessage() API is set to "*". This could allow for information
    disclosure due to the possibility of any origin allowed to receive the message.
  metadata:
    owasp:
    - A08:2021 - Software and Data Integrity Failures
    cwe:
    - 'CWE-345: Insufficient Verification of Data Authenticity'
    category: security
    technology:
    - browser
    subcategory:
    - audit
    likelihood: HIGH
    impact: MEDIUM
    confidence: MEDIUM
    references:
    - https://owasp.org/Top10/A08_2021-Software_and_Data_Integrity_Failures
  languages:
  - javascript
  - typescript
  severity: WARNING
  pattern: $OBJECT.postMessage(...,'*')