The primary security considerations for a hybrid application with components on both Salesforce and an external platform include:
1. **Secure Data Transfer**: Encrypt data transferred between Salesforce and the external platform using TLS/SSL to prevent interception.
2. **Authentication and Authorization**: Use secure authentication mechanisms like OAuth 2.0 and enforce proper authorization checks, including CRUD/FLS enforcement, to control access to data and operations.
3. **External Endpoint Security**: Test all external endpoints for vulnerabilities, including those used for authentication or data transfer. Obtain permissions for security testing of third-party endpoints.
4. **Storage of Sensitive Information**: Securely store sensitive data using protected custom metadata or named credentials. Avoid storing secrets in custom objects or public locations.
5. **Code Security**: Follow secure coding practices, such as avoiding dynamically loaded JavaScript or CSS, and ensure compliance with Salesforce security guidelines.
6. **Security Scans and False Positives**: Conduct automated security scans on all components, document false positives with justifications, and address high-severity vulnerabilities promptly.
7. **Session Management**: Use secure session management practices, such as obtaining session IDs securely and avoiding exposure of sensitive data in URLs.
8. **Compliance with AppExchange Requirements**: Ensure all components meet AppExchange security review requirements, including proper documentation and testing.
9. **Cross-Domain and CSP Configurations**: Address cross-domain misconfigurations and implement proper Content Security Policy (CSP) headers to mitigate risks like XSS.
10. **Dynamic Content Restrictions**: Avoid dynamically loading HTML, JavaScript, or CSS unless stripped of harmful content or loaded securely, such as within an iframe.
These measures help ensure the security and integrity of hybrid applications across Salesforce and external platforms. Let me know if you'd like more details!