A group is a collection of users that can receive permissions or resource access together. Groups usually describe a cohort, such as engineering or an API team, rather than a job function. They are useful for centralizing access across systems, but nested group structures can create complex inheritance and hidden privilege.
Expanded Definition
In identity and access management, a group is an access container that bundles users, service accounts, or other principals so permissions can be assigned once and inherited consistently. The useful distinction is that a group expresses shared access, while a role expresses job responsibility or a policy outcome. In practice, groups are often used to simplify entitlement management across applications, directories, and cloud platforms.
Definitions vary across vendors when groups are combined with nested membership, dynamic attributes, or rule-driven assignment, so practitioners should treat the term as implementation-specific unless the directory model is documented. A well-governed group reduces repetitive provisioning, but it can also obscure who actually holds access when membership is inherited through multiple layers. That is why NHI Management Group treats group design as an access-control problem, not just an administrative convenience, especially when groups are mapped to machine identities in Ultimate Guide to NHIs. The most common misapplication is using broad, nested group as a substitute for explicit entitlement design, which occurs when teams add members to convenience cohorts without reviewing inherited permissions.
Examples and Use Cases
Implementing groups rigorously often introduces review overhead, requiring organisations to weigh simpler provisioning against the risk of invisible privilege accumulation.
- An engineering group is granted repository read access, while a release group receives deployment rights in production.
- A service-account group is used to attach database permissions to a fleet of automation identities, then reviewed alongside rotation and offboarding controls.
- A cloud operations group centralizes access to monitoring tools, but nested membership must be documented to avoid hidden inheritance chains.
- A contractor group provides temporary access to shared development resources and is removed at project completion after validation against NIST Cybersecurity Framework 2.0 access governance expectations.
- A CI/CD support group is used to manage pipeline secrets and tool permissions, aligning access with the service lifecycle described in Ultimate Guide to NHIs.
In mature environments, group membership is often paired with periodic recertification and change logging so administrators can trace why access exists, not just who currently has it.
Why It Matters in NHI Security
Groups become especially important in NHI security because machine identities frequently inherit access through human-made structures that were never designed for high-churn automation. When a group contains a service account, API key workflow, or workload identity, any mistake in membership can expand privilege across large portions of the environment. NHIMG research shows that 97% of NHIs carry excessive privileges, which means group hygiene is often the difference between limited blast radius and broad compromise. The same research also notes that only 5.7% of organisations have full visibility into their service accounts, underscoring how group-based access can hide behind directory sprawl and stale membership. For governance teams, the issue is not merely assignment but evidence: who approved the group, what systems consume it, and whether the access still matches the current operational need. Group governance supports least privilege, but only if nested structures, orphaned accounts, and inherited access are continuously reviewed through an identity security lens. Organisations typically encounter group-driven overexposure only after an account is abused or an audit exposes unexplained access, at which point the group 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 and OWASP Agentic AI Top 10 address the attack and risk surface, while NIST CSF 2.0, NIST Zero Trust (SP 800-207) and NIST SP 800-63 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-02 | Group membership can hide excessive or inherited access for non-human identities. |
| NIST CSF 2.0 | PR.AC-4 | Access permissions management depends on controlled group assignment and review. |
| NIST Zero Trust (SP 800-207) | SP 5.2 | Zero Trust requires explicit access decisions rather than broad group trust. |
| NIST SP 800-63 | IAL2 | Identity proofing and account binding matter when groups grant sensitive access. |
| OWASP Agentic AI Top 10 | A01 | Agent and tool access can be overbroad when groups are used as coarse grants. |
Map group entitlements to least-privilege controls and recertify membership on a fixed cadence.
