Credential vaulting and the identity gap in human and machine access

At a glance

What this is: This is an analysis of credential vaulting as a control for reducing credential exposure, improving auditability, and centralising access to passwords, service accounts, API keys, and SSH keys.

Why it matters: It matters because IAM, PAM, and NHI teams often manage the same trust problem through different tooling, and vaulting only helps if lifecycle, access scope, and audit trails stay consistent across human and non-human identities.

By the numbers:

• 72% of organisations have experienced or suspect they have experienced a breach of non-human identities.

👉 Read Imprivata's analysis of credential vaulting for privileged access security

Context

Credential vaulting is the practice of centrally storing and controlling access to passwords, service accounts, API keys, certificates, and SSH keys. In identity terms, it tries to reduce the chance that a credential becomes a permanent, widely reused access token that can be copied, shared, or forgotten.

The governance gap is that many organisations still treat credential handling as a storage problem when it is really an access-lifecycle problem. Vaulting can help with visibility and rotation, but it only works when privilege scope, offboarding, and audit trails are enforced consistently across humans, service accounts, and third parties.

Key questions

Q: What breaks when credential vaulting is used without lifecycle governance?

A: Vaulting without lifecycle governance preserves control over storage but not over ownership, expiry, or offboarding. That leaves shared and service credentials available long after the need for access has changed. The result is auditability without accountability, which still creates exposure when a credential is copied into workflows, vendors, or scripts.

Q: Why do shared service accounts still create risk even when secrets are vaulted?

A: Shared service accounts remain risky because the vault may protect the secret while multiple systems continue to use the same identity. That makes attribution, separation of duties, and revocation difficult. The core problem is not where the secret sits, but whether one identity is being reused across unrelated tasks.

Q: How do security teams know if vaulting is actually reducing exposure?

A: Look for fewer direct secret disclosures, shorter credential lifetimes, and a higher percentage of retrievals tied to named approvals or workflows. If access logs show repeated retrieval of the same secret without rotation or review, the vault is centralising risk rather than reducing it.

Q: How should organisations govern vaulted credentials for third parties and automation?

A: Treat third-party and automated access as separate governance paths with distinct ownership, approval, and revocation rules. Third parties need time-bounded access and explicit offboarding, while automation needs tightly scoped machine identity controls. A shared vault does not eliminate the need to distinguish actor type.

Technical breakdown

Centralised credential vaults and secret exposure control

A credential vault acts as a protected control point for secrets rather than a simple password repository. It stores credentials in encrypted form, brokers access, and can rotate secrets after use so that the same secret is not exposed for long periods. This changes the attack surface by reducing direct disclosure, but it does not remove the need to govern who can request access, under what conditions, and for how long. In NHI terms, the vault becomes the policy boundary for service accounts, API keys, and shared system credentials.

Practical implication: define vault access policies by identity type and secret sensitivity, not by convenience or team ownership.

Auditability, accountability, and privileged access management

Vaulting is closely tied to PAM because both are about controlling high-risk access rather than merely authenticating users. A vault can create detailed logs of who accessed which credential, when, and for what purpose, which improves auditability and supports compliance reporting. The important distinction is that logging does not equal governance. If credentials remain shared, long-lived, or reusable across systems, the vault records misuse without preventing it. The control only works when access is time-bound and traceable to a named identity or workflow.

Practical implication: require per-access logging and reviewable provenance for every privileged secret retrieval.

Credential vaulting across human, third-party, and machine access

The article’s most useful point is that vaulting is not only for employees. It also applies to third parties, service accounts, and automated processes that need controlled access without seeing the underlying secret. That broadens the governance model from password management to lifecycle control across multiple actor types. If the same vault is used for all three, the organisation must still separate approval logic, revocation logic, and review cadence. Otherwise, the vault centralises risk instead of reducing it.

Practical implication: separate human, vendor, and workload access paths even when they share the same vault platform.

Breaches seen in the wild

• Sisense breach — unauthorized GitLab access led to exfiltration of access tokens, API keys and certificates.
• Dropbox Sign breach — compromised Dropbox Sign service account exposed API keys and OAuth tokens.

Read our 52 NHI Breaches Analysis report for a comprehensive view of breaches impacting Non-Human Identities including AI Agents.

NHI Mgmt Group analysis

Credential vaulting is an access-governance control, not just a storage control. The article correctly frames the problem as more than password protection because the real issue is reuse, visibility, and accountability across multiple systems. Centralisation helps, but only if access is brokered with policy and not merely parked in a secure repository. Practitioners should treat the vault as part of the control plane for secrets, not the endpoint of the control.

Shared credentials create identity ambiguity that PAM alone does not solve. When multiple users, systems, or vendors can retrieve the same secret, audit logs show access events but not necessarily intent or separation of duties. That is a governance failure because the organisation can no longer prove which actor used the credential for which purpose. The implication is that shared-secret patterns should be reduced wherever identity traceability matters.

Vaulting improves NHI hygiene, but it does not replace lifecycle management for service accounts. Service accounts, API keys, and SSH keys still need ownership, expiry, rotation, and offboarding rules. A vault that centralises these secrets without lifecycle discipline can preserve dormant access longer than the business relationship or task requires. Practitioners should view vaulting as one layer inside a broader NHI lifecycle model.

Credential vaulting exposes a named control gap we call credential custody drift. Custody drift occurs when a secret is technically protected yet operationally disconnected from the identity, system, or business process that depends on it. That assumption breaks when teams copy credentials into workflows, scripts, or third-party processes and then lose track of where they live. The implication is that organisations must rethink how custody, ownership, and use are linked across identity programmes.

Imprivata’s mention of AI agents is directionally correct, but the deeper issue is actor-type alignment. A vault that serves humans, third parties, and machine identities must differentiate between authentication, approval, and delegation. If it does not, the organisation collapses distinct governance requirements into one access pattern. Practitioners should align vault policy to the actor being governed, not to a generic secret request.

From our research:

• 72% of organisations have experienced or suspect they have experienced a breach of non-human identities, according to The 2024 ESG Report: Managing Non-Human Identities.
• Enterprises that have experienced a compromised NHI averaged 2.7 separate incidents in the past 12 months, according to The 2024 ESG Report: Managing Non-Human Identities.
• For a broader breach lens, the 52 NHI breaches Report shows how credential exposure and standing privilege repeatedly turn into operational compromise.

What this signals

Credential custody drift: the next governance failure is not secret theft alone, but the slow detachment of credentials from accountable ownership. As vaults centralise access across humans, vendors, and workloads, programmes will need clearer provenance rules and better offboarding discipline, or the vault becomes a container for lingering privilege rather than a control.

With 72% of organisations already experiencing or suspecting a non-human identity breach, the operational question is no longer whether credentials are targetable, but whether the programme can prove who may use them and when. That makes vault policy, recertification, and machine ownership part of the same governance design.

Teams should also align vaulting with zero trust and NHI lifecycle thinking rather than treat it as an isolated security appliance. The control value increases when access is brokered, monitored, and retired in line with identity state, not just stored behind an encrypted interface.

For practitioners

• Map every vaulted secret to a named owner Require an accountable business or technical owner for each password, service account, API key, certificate, and SSH key. If the owner cannot be named, the secret should be treated as an exception until offboarding and rotation responsibilities are assigned.
• Separate human, vendor, and workload access paths Use different approval logic, session controls, and revocation rules for employees, third parties, and automated processes even when they share the same vault platform. Shared tooling should not become shared governance.
• Enforce rotation after use for high-value secrets Set rotation triggers for privileged credentials that are retrieved for administrative work, break-glass activity, or third-party support sessions. Rotation should be paired with access review so the same access pattern is not silently repeated.
• Log retrieval provenance at the identity layer Record who requested the secret, which workflow approved it, and which system consumed it. Without provenance, a vault can prove that a credential was accessed but not that the access was legitimate or properly scoped.
• Review vaulted secrets during offboarding and recertification Include vaulted credentials in joiner-mover-leaver and access review processes so dormant secrets are not left behind when roles, vendors, or systems change. Offboarding must cover the secret as well as the user or service.

Key takeaways

• Credential vaulting reduces exposure, but it only works when access, ownership, and revocation are governed as one lifecycle.
• Shared and long-lived secrets remain a source of auditability without accountability unless vault retrievals are tied to named identities and workflows.
• Vaulting should be treated as part of PAM and NHI governance, not as a standalone storage layer for sensitive credentials.

Key terms

• Credential Vault: A credential vault is a controlled system for storing and brokering access to secrets such as passwords, tokens, certificates, and API keys. Its value is not just encryption but policy enforcement, access logging, and rotation discipline across identities and workflows.
• Credential Custody Drift: Credential custody drift is the loss of clear ownership and operational control over a secret after it has been centralised. The credential may be protected technically, yet still be copied into scripts, vendor processes, or shared workflows where accountability becomes unclear.
• Privileged Access Management: Privileged Access Management is the governance and control layer for high-risk access. It covers approval, session control, logging, and revocation for access that can affect critical systems, whether the actor is human, machine, or a third party.
• Service Account Lifecycle: Service account lifecycle refers to the creation, use, review, rotation, and retirement of non-human identities that support applications or infrastructure. The key governance question is whether each account remains tied to a current business purpose and a named owner.

Deepen your knowledge

Credential vaulting and privileged access governance are core topics in our NHI Foundation Level course, the industry's only accredited NHI security programme. If you are building controls for shared secrets, service accounts, or third-party access, it is worth exploring.

This post draws on content published by Imprivata: credential vaulting and privileged access security. Read the original.