mcp-server-semgrep/semgrep-rules/javascript/jsonwebtoken/security/audit/jwt-exposed-data.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: jwt-exposed-data
  message: >-
    The object is passed strictly to jsonwebtoken.sign(...)
    Make sure that sensitive information is not exposed through JWT token payload.
  metadata:
    owasp:
    - A02:2017 - Broken Authentication
    - A04:2021 - Insecure Design
    cwe:
    - 'CWE-522: Insufficiently Protected Credentials'
    source-rule-url: https://semgrep.dev/blog/2020/hardcoded-secrets-unverified-tokens-and-other-common-jwt-mistakes/
    asvs:
      section: 'V3: Session Management Verification Requirements'
      control_id: 3.5.3 Insecue Stateless Session Tokens
      control_url: https://github.com/OWASP/ASVS/blob/master/4.0/en/0x12-V3-Session-management.md#v35-token-based-session-management
      version: '4'
    category: security
    technology:
    - jwt
    cwe2021-top25: true
    subcategory:
    - audit
    likelihood: LOW
    impact: LOW
    confidence: LOW
    references:
    - https://owasp.org/Top10/A04_2021-Insecure_Design
  languages:
  - javascript
  - typescript
  severity: WARNING
  patterns:
  - pattern-inside: |
      $JWT = require('jsonwebtoken');
      ...
  - pattern-either:
    - pattern-inside: function (...,$INPUT,...) {...}
    - pattern-inside: function $F(...,$INPUT,...) {...}
  - pattern: $JWT.sign($INPUT,...)