rules:
- id: ruby-jwt-decode-without-verify
  message: >-
    Detected the decoding of a JWT token without a verify step.
    JWT tokens must be verified before use, otherwise the token's
    integrity is unknown. This means a malicious actor could forge
    a JWT token with any claims.
  metadata:
    cwe:
    - 'CWE-345: Insufficient Verification of Data Authenticity'
    owasp:
    - A08:2021 - Software and Data Integrity Failures
    - A08:2025 - Software or Data Integrity Failures
    source-rule-url: https://semgrep.dev/blog/2020/hardcoded-secrets-unverified-tokens-and-other-common-jwt-mistakes/
    category: security
    technology:
    - jwt
    references:
    - https://owasp.org/Top10/A08_2021-Software_and_Data_Integrity_Failures
    subcategory:
    - audit
    likelihood: LOW
    impact: LOW
    confidence: LOW
  languages: [ruby]
  severity: WARNING
  patterns:
  - pattern-inside: |
      require 'jwt'
      ...
  - pattern: |-
      JWT.decode($PAYLOAD,$SECRET,false,...)