After identifying and describing information security risks, the next step required by ISO/IEC 27005 is to identify and assign risk owners. In the lexicon of ISO/IEC 27005 and the broader ISO 31000 framework, a risk owner is defined as a person or entity with explicit accountability and authority to manage a specific risk. To mitigate, transfer, or accept risk, a designated individual must have the authority to make informed decisions and the organisational leverage to allocate the financial and human resources needed to address it.

Identifying risk owners isn't just an administrative or compliance check; it is a core governance requirement under ISO/IEC 27001:2022. Effective risk ownership bridges the massive gap between theoretical risk assessment and practical, operational resilience. Risk owners are typically drawn from top management, process owners, functional directors, department managers, and specific asset owners. Their responsibilities extend throughout the entire risk management lifecycle. They must understand the risk scenarios, approve the risk treatment plans, and make the final, informed executive decision on accepting any residual risk after controls are implemented.

A significant challenge in the information security industry is identifying and empowering true risk owners in highly decentralised, cross-functional, and agile organisational structures. In legacy, hierarchical corporate models, the lines of authority were distinct, making the assignment of risk ownership relatively straightforward based on department titles. However, the modern enterprise increasingly relies on cloud-native development paradigms, DevOps methodologies, and platform engineering. In these environments, infrastructure is provisioned dynamically via code by autonomous agile squads, while separate engineering functions maintain the underlying platforms. This decentralisation creates profound ambiguity regarding who genuinely owns the risk.

If a severe vulnerability is introduced into a microservice through a newly imported open-source dependency, determining ownership can be highly complex. Does the risk belong to the individual developer who committed the code, the product manager prioritising feature velocity over security, the platform engineering team providing the CI/CD pipeline, or the central security team?. When security teams attempt to claim risk ownership unilaterally, they often find themselves lacking the operational authority to force code changes or halt production deployments, reducing them to an advisory role without enforcement capability. Conversely, when product managers are designated as risk owners, they frequently lack the specialised cybersecurity knowledge required to fully comprehend the nuances of the threat landscape, leading to an inappropriate and dangerous acceptance of severe risks. To address this governance gap, mature organisations are adopting federated governance models and clear RACI (Responsible, Accountable, Consulted, Informed) matrices that place ultimate accountability with business unit leaders, while integrating security champions into agile squads to ensure that domain experts inform risk owners before acceptance decisions are made.