A shared security model assigns responsibility for prevention across employees, IT, security, and leadership rather than treating the user as the only control. It works only when the organisation provides usable controls, clear procedures, and fast recovery paths that reduce the impact of inevitable human error.
Expanded Definition
A shared security model distributes security responsibility across the people who build, operate, approve, and use systems, instead of treating end users as the sole control point. In NHI and IAM programs, that means engineering provides safer defaults, security defines policy, IT maintains recovery paths, and leadership sets accountability for follow-through.
The concept aligns with the intent of the NIST Cybersecurity Framework 2.0, which frames cybersecurity as a governance and operational discipline, not just a user behavior problem. It is especially relevant where humans interact with service accounts, secrets, approvals, and recovery workflows that are easy to misuse under pressure. The term is sometimes used loosely to mean “everyone is responsible,” but that interpretation is incomplete unless the organisation also removes avoidable friction and gives teams clear controls to use.
Definitions vary across vendors, but in practice a shared security model is only credible when the organisation can show who owns prevention, who owns detection, and who owns rapid remediation. The most common misapplication is blaming users for errors that happen because the control design, approval path, or rollback process was too hard to follow.
Examples and Use Cases
Implementing a shared security model rigorously often introduces coordination overhead, requiring organisations to balance accountability clarity against slower change management and approval fatigue.
- Security defines secret-handling policy, while platform engineering enforces rotation and storage in approved systems rather than relying on developer memory alone.
- IT provides a break-glass recovery path for locked-out service owners, reducing downtime when a token expires or a certificate is revoked unexpectedly.
- Leadership requires measurable ownership for NHI lifecycle steps, so offboarding an integration includes revoking keys, deleting unused access, and confirming downstream dependencies.
- Operations teams monitor usage anomalies, while application teams explain whether a spike is legitimate automation or a sign of credential abuse, consistent with the visibility concerns in Ultimate Guide to NHIs.
- Incident response playbooks assign both technical remediation and business notification duties, so a compromised API key is handled as a shared operational event rather than a lone admin task.
This model also fits guidance from The State of Non-Human Identity Security, where visibility gaps and weak rotation practices show that responsibility cannot sit with one team alone. In NHI programs, shared accountability is what turns policy into day-to-day execution.
Why It Matters in NHI Security
Shared security models matter because NHIs fail in the gaps between teams. A service account may be created by development, approved by infrastructure, stored by operations, and later forgotten by the business owner. When no single group owns the full lifecycle, secrets linger, privileges expand, and recovery gets delayed. NHIMG research shows that 97% of NHIs carry excessive privileges and only 5.7% of organisations have full visibility into service accounts, which makes fragmented accountability a direct risk factor rather than an administrative inconvenience.
The issue becomes more serious in environments where The State of Non-Human Identity Security reports that only 1.5 out of 10 organisations are highly confident in securing NHIs. That confidence gap usually reflects ownership confusion, not just tool gaps. A shared security model helps map prevention, detection, and response to the teams that can actually act. It also supports the practical intent of the NIST Cybersecurity Framework 2.0 by tying governance to measurable operational duties. Organisations typically encounter the cost of a weak shared security model only after a secrets leak, API abuse incident, or failed revocation effort, at which point accountability becomes operationally unavoidable to address.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 address the attack and risk surface, while NIST CSF 2.0 and NIST SP 800-63 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | GV.OC, PR.AC | Frames security as shared governance and access control responsibility. |
| OWASP Non-Human Identity Top 10 | NHI-01 | Shared responsibility reduces NHI lifecycle gaps that lead to privilege and secret exposure. |
| NIST SP 800-63 | Supports assurance thinking where identity processes need accountable operators and recovery paths. |
Define lifecycle owners for every NHI so creation, rotation, and revocation are not left to one team.
