Leakage of sensitive data in JWT

  • Rule ID: ruby_lang_jwt
  • Languages: ruby
  • Source: jwt.yml

Description

JWTs are not a secure place to store sensitive data. This rule looks for any sensitive data types saved to a JWT.

Remediations

❌ Avoid storing sensitive data in JWT:

payload = { data: 'data', email: user.email }
token = JWT.encode payload, hmac_secret, 'HS256'

✅ If you need to store user's information, use their unique database identifier instead of personal identifiable information:

payload = { data: 'data', user_id: user.uuid }
token = JWT.encode payload, hmac_secret, 'HS256'

Associated CWE

OWASP Top 10

Configuration

To skip this rule during a scan, use the following flag

bearer scan /path/to/your-project/ --skip-rule=ruby_lang_jwt

To run only this rule during a scan, use the following flag

bearer scan /path/to/your-project/ --only-rule=ruby_lang_jwt

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