Ensuring cybersecurity in the context of cloud technologies requires effective cooperation between organizations that jointly operate information systems within a shared infrastructure. This is especially relevant for structures with hierarchical management systems and departmental information protection requirements. In such settings, a coalition-based approach to cybersecurity management plays a key role by aligning the actions of various participants to achieve a common goal—protecting information assets in cloud environments. Research shows that coordinated efforts enhance the effectiveness of protection, reduce data leakage risks, and contribute to system dependability. This approach is particularly critical for networks of situational centers operating in the national security domain. This study explores the use of the Role-Based Access Control (RBAC) model, the method of one-time logins, and proposes an organizational and technical model for access management in coalition-based cybersecurity systems built on cloud technologies. This work applies methods of systems analysis, architectural modeling of information systems, formalization of access roles based on the RBAC (Role-B
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