Who is responsible for the security posture and policies relevant to an information system?

The Information System Security Officer (ISSO) is the individual responsible for overseeing the security posture and policies related to an information system. This role involves ensuring that the system complies with relevant security standards and regulations while protecting sensitive data from vulnerabilities and threats. The ISSO develops, implements, and maintains security policies that guide the organization’s approach to managing security risks.

In performing this role, the ISSO collaborates with various stakeholders to ensure that the security measures and protocols are effectively integrated into the system's lifecycle. They also play a key role in risk assessments, incident response planning, and training personnel on security awareness, further solidifying their responsibility for the information system's overall security posture.

The involvement of others in security-related decisions, such as the Authorizing Officer who focuses on authorization decisions for information systems, the Chief Executive Officer who provides strategic direction and resources, and the Risk Executive who oversees risk management across the organization, does not diminish the specific responsibilities that fall under the ISSO's purview regarding direct oversight of system security.