This security white paper provides a comprehensive technical overview of Passbolt Pro Edition v5.10, detailing its design, architecture, security mechanisms, and residual risks. It is intended for security professionals, IT administrators, auditors, and decision-makers who understand the significance of selecting a robust solution for managing sensitive information. The document outlines guiding principles such as client-side end-to-end encryption, granular encryption, and strong non-phishable authentication, emphasizing the importance of user control over secrets. It also discusses the core concepts of resources and secrets, explaining how credentials are structured and managed within the platform. Additionally, the paper describes resource permissions, organizational structures like groups and folders, and the roles assigned to users within the system. By presenting this information, the white paper aims to assist readers in evaluating Passbolt as a secure credential management solution.