Use separate permissions for viewing, editing, managing membership, and deleting collections. Then recertify those rights on a regular access review cycle so that convenience does not turn into standing authority. The key control is to keep management rights narrow enough that shared access stays intentional, not accumulated by default.
Why This Matters for Security Teams
shared vault collections are meant to reduce friction, but they often become a quiet source of privilege creep when “temporary” access is never reviewed and management rights spread beyond the people who actually administer the collection. The problem is not only who can read a secret, but who can add members, change permissions, and delete the collection itself. That distinction matters because collection control often becomes a proxy for broader trust. OWASP’s Non-Human Identity Top 10 and NHIMG’s Guide to the Secret Sprawl Challenge both point to the same operational reality: access tends to accumulate faster than ownership discipline.
Once a shared vault collection becomes the default place for collaboration, teams may mistake convenience for entitlement. That is how editor rights drift into membership management, and membership management drifts into full administrative authority. In practice, many security teams encounter privilege creep only after an audit, an offboarding event, or an unexpected secret exposure has already shown how broad collection control had become.
How It Works in Practice
The practical fix is to split collection permissions into narrow, reviewable functions and then treat each one differently in access governance. Viewing should not imply editing. Editing should not imply managing membership. Managing membership should not imply deletion. This is especially important in shared vaults because collection administrators often gain the ability to expand access without ever touching the secret values themselves.
A workable operating model usually includes four control layers:
- Read access for approved consumers who need secrets for runtime use.
- Edit access for a small set of stewards who maintain collection content.
- Membership management for collection owners or delegated approvers only.
- Deletion rights reserved for platform administrators or tightly controlled break-glass roles.
That model should be paired with recurring recertification. The review cadence depends on risk, but current guidance suggests high-churn teams need faster cycles than stable infrastructure groups. The point is to catch permission drift before it becomes standing authority. If a collection is used by both humans and agents, the same discipline should apply to each identity type, because the vault does not care whether access came from a person, a script, or an agent.
This also aligns with the broader NHI lifecycle problem described in NHIMG’s The 2025 State of NHIs and Secrets in Cybersecurity, where overuse and exposure are common failure modes. If teams want a deeper baseline on secret sprawl and why central governance breaks down, NHIMG’s Guide to the Secret Sprawl Challenge is directly relevant. For related implementation guidance, CISA’s Zero Trust Maturity Model reinforces the idea that access must be explicit, constrained, and continuously evaluated.
These controls tend to break down when collection ownership is shared across many teams and no single reviewer is accountable for permission hygiene.
Common Variations and Edge Cases
Tighter collection controls often increase operational overhead, so organisations have to balance speed of collaboration against the risk of unmanaged authority. In environments with many short-lived projects, that tradeoff becomes more visible because permissions are created quickly and forgotten just as quickly.
A few edge cases need special handling. First, break-glass access should be time-bound and fully logged, not left as a standing admin path. Second, delegated administration can work, but only if the delegation itself is reviewed and limited to a defined scope. Third, if a collection supports automation, the service identity should be separated from human membership so the permission model does not blur under shared convenience.
Best practice is evolving around whether collection-level roles are enough, or whether teams should layer policy checks outside the vault as well. There is no universal standard for this yet, but the direction is clear: metadata, ownership, and recertification should all support least privilege rather than merely document it. NHIMG’s Ultimate Guide to NHIs — Key Challenges and Risks is useful here because privilege creep in shared collections usually appears alongside broader NHI sprawl, not in isolation.
The practical test is simple: if a person can quietly expand access without a second approver, the collection is already too permissive.
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 CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-03 | Addresses secret and permission sprawl in shared NHI-backed vault access. |
| NIST CSF 2.0 | PR.AC-4 | Least privilege and access governance are central to stopping collection privilege creep. |
| NIST CSF 2.0 | PR.AC-1 | Identity and credential lifecycle controls support intentional shared-vault access. |
Ensure every collection entitlement has an accountable owner and documented approval path.
