Audit it by checking IAM policy on the secret or project and identifying who can add, enable, disable, or manage secret versions through the Google Cloud Secret Manager Secret Version Manager Role. Review each principal for business need, then reduce access so version management is restricted to approved automation and a small set of administrators.
What exactly the Secret Version Manager role lets someone do
In Google Cloud Secret Manager, this role is the permission boundary for version-level administration, not just read access. Auditing it means identifying every principal that can change the state of a secret version, then checking whether that authority is actually needed for operations, deployment automation, or break-glass administration. The practical question is not “who can see the secret”, but “who can alter the version lifecycle”.
That distinction matters because version management can change which secret value is active, which version is disabled, and who can recover or re-enable a version later. If that role is granted too broadly, you are not only expanding operational access, you are expanding the set of identities that can influence production authentication material.
For the broader IAM context around Google Cloud roles, inheritance, custom roles, and least privilege, the Google Cloud IAM and Service Accounts Guide is the most useful starting point.
How to find every principal that holds it
Start by checking the IAM policy where the role is granted. In Google Cloud, that may be on the secret itself or inherited from the project or folder, so a spot check on only one resource is not enough. You want the effective access picture, not just the local binding list.
Review each binding for users, groups, service accounts, and any broader principals that inherit access through Google Group membership or organization-level policy design. Then separate direct human access from automation. Version management should usually be limited to a small set of administrators plus a narrowly defined automation identity that actually performs rotation or deployment tasks.
If you need a structured way to think about approvals, recertification, and auditability around privileged access, NHIMG’s Ultimate Guide to NHIs — Regulatory and Audit Perspectives is a good reference point for the governance side of the review.
For the mechanics of effective role review, the important question is whether the principal is bound directly, inherited indirectly, or present only because of a group or service account relationship. If you do not resolve inheritance, you can miss the real holder of the permission and understate the blast radius of the role.
What to remove, keep, and verify after the review
Once you have the principals, compare them against the business need behind version management. The role should usually exist only where a principal must create, enable, disable, or otherwise control secret versions as part of a defined process. If the principal only needs to consume the current secret value, this role is broader than necessary.
Use the review to distinguish ordinary access from privileged change authority. That is where the risk often hides: version-management permissions can outlast the project, pipeline, or team that originally needed them. NHIMG’s Guide to the Secret Sprawl Challenge is useful for understanding how secret ownership and exposure drift when access is not actively trimmed.
After you reduce the binding set, verify that the remaining principals still support rotation, emergency recovery, and deployment continuity. A good audit outcome is not zero access, it is tightly bounded access with a clear owner, a documented reason, and a reviewable approval trail.
Risk and Threat Considerations
Overbroad version-management access creates a direct path from IAM weakness to secret tampering. If an attacker or careless insider can disable the good version, enable a stale one, or swap versions during deployment, they can cause authentication failures, persistence, or silent service compromise.
Failure mechanism: Excessive role assignment, inherited bindings, or unmanaged automation identities let unauthorized principals alter secret version state without detection until a dependent workload breaks or a compromised version is used.
Impact: The result can be outage, credential exposure, privilege abuse, or a delayed incident response because teams assume the active secret is trustworthy when it is not.
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 addresses the attack and risk surface, while NIST SP 800-53 Rev 5 and CIS Controls v8 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | AC-6 — Least Privilege | Restricts who can manage secret versions to the minimum required principals. |
| IA-5 — Authenticator Management | Secret version control affects lifecycle handling of authentication material. | |
| Recommendation — Limit secret-version management to the smallest approved set of administrators and automation identities. Track and rotate the secret material whose versions are being managed. | ||
| CIS Controls v8 | CIS-6 — Access Control Management | Covers reviewing and reducing excessive access to sensitive cloud resources. |
| Recommendation — Review and remove unnecessary principals from secret-version administration. | ||
| OWASP Non-Human Identity Top 10 | NHI-05 — Overprivileged NHI | Automation identities managing secrets should not have broader version permissions than needed. |
| NHI-01 — Improper Offboarding | Stale admins or automation can retain secret-management access after they should be removed. | |
| Recommendation — Constrain automation identities to only the secret-version actions they require. Revoke secret-version access when the owning team or workflow no longer needs it. | ||
Practitioner Guidance
What to verify: Confirm whether the role is granted at the secret, project, or higher scope, because the scope determines how much unrelated access is being inherited. Also verify that the principal still has an active operational need, not just historical ownership.
Decision rule: If the principal is a human account, treat that as a candidate for removal unless there is a documented administrator function. If it is automation, confirm that the automation is the minimum necessary identity and that its use is tied to a specific rotation or deployment workflow.
Practitioner takeaway: Auditing this role is really an audit of who can change the secret’s active state, so the key judgement is whether version control is limited to the smallest set of accountable administrators and automation identities.