Couchbase Server 5.0 introduces enhanced security features through Role-Based Access Control (RBAC), replacing the previous bucket password system with user-specific roles that offer varying levels of access. This update allows for more granular control over data access by creating users with specific permissions, improving security and reducing exposure. Users can be created via the Couchbase Web Console or the REST API, and roles can be managed with N1QL commands. The system supports a wide range of permissions, including query, data reading, and administrative tasks, allowing for tailored user roles across different buckets. Feedback on these new features is encouraged as the full release approaches, with the Couchbase team actively seeking input from users to refine the system.