A redundant group is a group that duplicates the purpose or membership pattern of another group. Redundancy usually appears when different admins create similar groups over time without a shared inventory or governance process. These groups add complexity, increase review workload, and make it harder to understand which group actually carries the intended access.
Expanded Definition
A redundant group is not just a duplicate entry in an identity platform. In NHI governance, it is a second or third group that effectively grants the same access path, or represents the same business function, as an existing group. That distinction matters because redundancy creates ambiguity about which group is authoritative, which one should be reviewed, and which one should be decommissioned. The term is often used alongside group sprawl, but the two are not identical: sprawl describes volume, while redundancy describes overlap. In practice, redundant groups make entitlement reviews harder, obscure effective access, and increase the chance that stale memberships persist after role changes or project closures. The most common misapplication is treating near-identical groups as harmless administrative variance, which occurs when multiple teams create access groups without a shared naming standard, inventory, or ownership model.
For governance context, the NIST NIST Cybersecurity Framework 2.0 reinforces the need to understand who has access and why, even when that access is mediated by group membership rather than direct assignment. NHIMG treats redundant groups as a control problem, not just a housekeeping issue. See the Ultimate Guide to NHIs for the broader visibility and lifecycle context.
Examples and Use Cases
Implementing group governance rigorously often introduces administrative friction, requiring organisations to weigh cleaner access models against the cost of reconciling existing entitlements.
- A CI/CD platform has two groups for deployment access, each granting the same repository and cluster permissions, because two engineering teams created them in different quarters.
- An API service account is added to both a legacy support group and a newer platform group, making it unclear which group is the intended source of access during review.
- A cloud automation workflow uses a regional operations group, while a second group mirrors the same membership for a renamed business unit, duplicating entitlement paths.
- A merger brings in inherited directory groups that overlap with the buyer’s internal groups, creating duplicate access patterns that persist until a formal cleanup occurs.
These patterns are common in environments where Ultimate Guide to NHIs shows that only 5.7% of organisations have full visibility into their service accounts. For identity design, the NIST Cybersecurity Framework 2.0 is useful as a reference point for access accountability, even though it does not define group redundancy as a standalone term.
Why It Matters in NHI Security
Redundant groups expand the attack surface because each extra group is another place where privilege can be hidden, inherited, or forgotten. In NHI environments, that matters more than it might in human IAM because service accounts, bots, pipeline identities, and workload identities often depend on group membership for access to secrets, registries, cloud roles, and production systems. Redundancy also undermines review quality: if reviewers cannot tell which group is authoritative, they may approve both, leaving excessive access in place. NHIMG research shows that 97% of NHIs carry excessive privileges, and redundant groups are one of the structural reasons this excess persists. The Ultimate Guide to NHIs also notes that 80% of identity breaches involved compromised non-human identities such as service accounts and API keys, which makes clean group governance operationally significant rather than optional.
Practitioners should treat redundant groups as evidence that lifecycle control has drifted: naming, ownership, review cadence, and decommissioning are no longer aligned. Organisations typically encounter the consequences only after an access review, audit finding, or incident response effort exposes overlapping entitlements, at which point redundant group cleanup 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-01 | Redundant groups create hidden access paths and unclear ownership in NHI governance. |
| NIST CSF 2.0 | PR.AC-4 | Group-based access must be managed and reviewed to preserve least privilege. |
| NIST Zero Trust (SP 800-207) | 3e | Zero Trust requires continuous evaluation of authorization paths, including group membership. |
| NIST SP 800-63 | AAL2 | Identity assurance depends on reliable assignment and revocation of access entitlements. |
| OWASP Agentic AI Top 10 | A1 | Agentic systems can inherit duplicated permissions through group sprawl and weak authorization boundaries. |
Inventory group-to-access mappings and remove duplicate entitlement paths before they inflate privilege.
