When designing component architecture and data flow in managed packages, consider these security aspects:
**Component Property Security:**
When component properties are derived internally but passed from external sources, potential risks include:
- Injection attacks leading to vulnerabilities like cross-site scripting (XSS) or SQL injection
- Data manipulation by external sources to exploit the system
- Unauthorized access to sensitive data
**Mitigation Strategies:**
- Sanitize and validate all inputs, even if they originate internally but are influenced by external sources
- Enforce proper Create, Read, Update, and Delete (CRUD) and Field-Level Security (FLS) checks
- Avoid unsafe data binding by not binding user-controlled data directly to unsafe attributes
- Use secure coding practices, leverage sanitization libraries, and adhere to strict Content Security Policies (CSP)
**Large-Scale Architecture Security:**
For large-scale custom object architectures:
- Implement comprehensive CRUD/FLS checks throughout the system
- Use "User Mode" to enforce CRUD/FLS checks and simplify compliance with security requirements
- Document and address all sharing violations on a case-by-case basis (note that sharing violations in batch classes and custom objects may be acceptable, but DML operations involving standard objects with sharing violations will likely fail review)
- Store sensitive data securely, such as in protected custom settings or metadata
- Review and document any external integrations to ensure they comply with security standards
**Secure File Transfer and Data Rendering:**
For large file transfers or data rendering from client-side components:
- Use secure protocols like SFTP with encryption to protect data in transit
- Serve all client-side scripts statically from the package's static resources folder
- Avoid dynamically loading third-party scripts or data from external sources
- Always validate and sanitize user inputs to prevent vulnerabilities
**External Client Application Architecture:**
The recommended architecture for external client applications depends on your specific business use case. Evaluate your requirements to decide whether to use external client applications or connected apps. For detailed guidance, refer to the External Client Apps documentation.