Secret vault sprawl is creating governance gaps across NHI estates

At a glance

What this is: Akeyless argues that secret vault sprawl creates isolated pockets of credentials, certificates, and keys that are harder to govern, rotate, and audit across hybrid and multi-cloud estates.

Why it matters: For IAM and NHI teams, vault sprawl turns access control into a fragmented lifecycle problem, weakening observability, compliance, and response across machine identities and privileged secrets.

👉 Read Akeyless' analysis of secret vault sprawl and NHI governance gaps

Context

Secret vault sprawl is a governance problem, not just a storage problem. When credentials, certificates, and keys are scattered across cloud vaults, Kubernetes secrets, and self-managed platforms, security teams lose a single view of who can use which machine identity and under what conditions.

In practice, each additional vault introduces another policy surface for rotation, logging, and offboarding. That fragmentation matters because machine identities are often the stepping stone for further compromise, and uncontrolled secrets make it harder to detect misuse before access turns into lateral movement.

The article frames the challenge as a hybrid and multi-cloud lifecycle issue: secrets are created where development happens, but they are governed as if one team, one vault, and one control plane were still enough.

Key questions

Q: What breaks when secrets are duplicated across multiple tools and vaults?

A: Revocation becomes unreliable, rotation states diverge, and audit evidence no longer tells a complete story. A credential may be disabled in one place while still active in another, which means exposure can persist even after the security team believes the secret has been remediated.

Q: Why do secret vault silos increase security risk?

A: They increase risk because each vault becomes a separate trust boundary with its own policy, logging, and lifecycle gaps. That fragmentation makes it easier for a leaked secret to go unnoticed and harder to limit how far a compromised machine identity can move once it is used.

Q: How do security teams know if vault sprawl is undermining control?

A: Look for missing ownership, inconsistent rotation schedules, uneven logging, and secrets that cannot be mapped cleanly to a business service or environment. If teams cannot inventory secrets across all vaults without manual effort, governance is already incomplete.

Q: Should organisations centralise all secrets into one vault?

A: Not automatically. Centralisation improves visibility only if access boundaries, environment separation, and lifecycle controls are strong enough to prevent one compromise from spreading. In some environments, a single control plane is useful, but the real question is whether it reduces blast radius without creating a single point of failure.

Technical breakdown

Why secret vault sprawl breaks governance

Secret vault sprawl happens when different teams, projects, or environments keep credentials in separate vaults and secret stores. The problem is not merely duplication. It is the loss of a consistent control plane for access policy, rotation, inventory, and revocation. Once secrets are distributed across cloud-native vaults, Kubernetes secrets, and self-hosted systems, no team has a complete picture of where privileged material lives or who can still use it. That makes governance reactive instead of continuous, especially in hybrid estates where machine identities depend on secrets to authenticate.

Practical implication: treat vault count and vault ownership as governance data, not infrastructure trivia.

How distributed secrets expand the attack surface

Every additional vault extends the number of places an attacker can target for credential theft, misuse, or persistence. Machine identities are attractive because they often unlock services rather than just a single account, so one exposed secret can become a stepping stone into other systems. Fragmented storage weakens monitoring because usage signals are split across tools and platforms. That leaves security teams with blind spots in detection, slower incident scoping, and less confidence that a compromise has been contained.

Practical implication: map which secrets can reach which services before you assume blast radius is limited.

Why centralised control matters more than centralised storage

The article’s key distinction is between a single place to store secrets and a single way to govern them. A central store helps, but the deeper issue is whether the organisation can track, update, and revoke secrets across all environments without losing policy consistency. For NHI governance, the control objective is lifecycle visibility: inventory, access scope, rotation status, and decommissioning. Without that, vaults may still exist as islands of trust even if they are technically connected.

Practical implication: evaluate whether your current architecture governs the lifecycle of secrets or merely their location.

Threat narrative

Attacker objective: The attacker wants to turn one exposed machine secret into broader access across services and environments while remaining difficult to detect.

1. Entry begins when a machine identity secret is exposed or over-shared inside one of many disconnected vaults or secret stores.
2. Credential access follows because the secret grants authentication to services, APIs, or workloads that trust the token, key, or certificate.
3. Escalation and lateral movement occur when that identity can be reused to reach additional systems, turning one secret into broader access.
4. Impact is the loss of visibility and containment, with harder-to-detect intrusion, compliance exposure, and potential customer trust damage.

Breaches seen in the wild

• Hugging Face Spaces breach 2024: Unauthorised access to Hugging Face Spaces may have exposed secrets users stored for AI apps; tokens were revoked and org tokens removed.
• Toyota T-Connect key exposure 2022: A subcontractor left a T-Connect server key on public GitHub from 2017 to 2022; 296,019 customers' emails were exposed, misuse unknown.

Read and download The State of NHI & AI Agent Breach Report 2026, covering 150+ breaches impacting Non-Human Identities including AI Agents.

NHI Mgmt Group analysis

Vault sprawl is a lifecycle governance failure, not a tooling preference. When secrets are spread across cloud vaults, Kubernetes secrets, and self-managed stores, the organisation no longer has one governable lifecycle for credentials, certificates, and keys. That fragmentation breaks ownership, review, and revocation into local decisions that do not add up to enterprise control. The practitioner conclusion is simple: governance has to follow the secret, not the vault boundary.

Secret storage and secret governance are different problems. A single vault can reduce duplication, but it does not automatically solve access scope, rotation discipline, or offboarding across every environment. The article correctly points to observability as the control gap: without complete inventory and usage visibility, policy becomes partial by definition. The practitioner conclusion is that centralisation without lifecycle control only narrows the blind spots.

Machine identities become harder to defend when their secrets are managed as isolated project assets. The article shows why secret silos are especially dangerous in hybrid and multi-cloud estates, where each environment has its own access model and operational cadence. That creates a weak-link dynamic in which the least governed vault determines the resilience of the whole estate. The practitioner conclusion is to assess machine identity risk at the estate level, not per environment.

Secret vault sprawl creates an identity blast radius problem. Once credentials are distributed across multiple storage systems, the question is not whether a secret leaks, but how far that secret can travel before governance catches up. This is where OWASP-NHI and zero trust thinking converge: access must be scoped and observable across the full path of use, not just where it is stored. The practitioner conclusion is to design controls around reach, not repository count.

Unified control planes will matter more than vault branding. The market direction implied by this article is clear: teams are moving from isolated secret stores toward connected governance layers that can inventory, broker, and revoke access across environments. That does not eliminate vaults, but it changes what buyers should value first. The practitioner conclusion is to test whether a platform can govern distributed secrets consistently before judging how well it stores them.

From our research library:

• 88% of security professionals are concerned about secrets sprawl, with 49% of those in larger organisations described as "very concerned", according to the 2024 State of Secrets Management Survey.
• Only 44% of organisations are currently using a dedicated secrets management system, according to the 2024 State of Secrets Management Survey.
• Read next: Guide to the Secret Sprawl Challenge

What this signals

Identity blast radius grows when vaults fragment. A secret that sits in a disconnected store is not just harder to find, it is harder to govern through its full lifecycle. For NHI programmes, the practical shift is to measure where access paths outgrow repository boundaries and where revocation stops being authoritative.

Central control matters because inventory is the prerequisite to policy. If a team cannot say which machine identities are backed by which secrets, then rotation and offboarding are already partial controls. The next maturity step is not another vault, but a governance layer that can assert policy consistently across them.

Vaultless architecture is really a governance assertion. The article’s direction of travel is less about eliminating storage systems and more about eliminating blind spots. That puts secret ownership, auditability, and lifecycle enforcement ahead of tool preference in any NHI roadmap.

For practitioners

• Define a secret inventory owner Assign accountable owners for every credential, certificate, and key so each secret has a lifecycle record, rotation expectation, and revocation path.
• Map vaults to trust boundaries Document which workloads, environments, and teams rely on each vault so you can see where governance is fragmented and where policy drift is most likely.
• Unify rotation and revocation rules Apply the same rotation cadence and emergency revocation process across cloud vaults, Kubernetes secrets, and self-managed stores to remove local exceptions.
• Measure secret visibility gaps Track how many secrets lack central visibility, usage logging, or clear ownership, because those are the areas most likely to resist containment during an incident.
• Plan for vaulted-to-centralised migration Use a staged migration plan for secrets that can move to a single management plane, while identifying which environments need a connector model instead of relocation.

Key takeaways

• Secret vault sprawl creates a governance gap because secrets become harder to inventory, rotate, and revoke across hybrid estates.
• The article points to fragmentation, not storage alone, as the main risk driver behind weak visibility and larger attack surfaces.
• The practical response is to restore unified lifecycle control, either by centralising secrets or by governing existing vaults through one management plane.

Key terms

• Secret Vault Sprawl: The condition where credentials, keys, and certificates are scattered across multiple vaults or secret stores without a single governance model. It creates visibility gaps, inconsistent rotation, and uneven revocation, which makes machine identity control harder across hybrid and multi-cloud environments.
• Secret Silo: A secret silo is a separate storage location where credentials, certificates, or keys are managed independently from the rest of the estate. In practice, siloing fragments ownership, rotation, auditability, and incident response, creating hidden control boundaries that are difficult to govern consistently.
• Machine Identity: The digital identity of a machine, device, or workload, such as a server, container, or VM, used to authenticate it within a network. Sometimes used interchangeably with NHI, though NHI is the broader category.
• Centralized Secrets Management: Centralized secrets management is the practice of storing, governing, and rotating secrets from a single control plane or consistent policy layer. It reduces duplication, improves visibility, and makes access rules easier to enforce across hybrid and multi-cloud environments. The value is operational consistency, not just storage consolidation.

What's in the full article

Akeyless' full article covers the operational detail this post intentionally leaves for the source:

• Step-by-step migration options for moving secrets out of distributed vaults
• How the Universal Secrets Connector handles view, update, and deletion across external vaults
• Operational trade-offs between a fully vaultless model and a connected-vault model
• The article's discussion of RBAC for certificates, tokens, and authorization keys

👉 Akeyless' full post covers vault migration options, centralised management, and the connector model in more operational detail.

Deepen your knowledge

NHI governance, agentic AI identity, and machine identity lifecycle are core topics in our NHI Foundation Level course, the industry's only accredited NHI security programme. If you are building or maturing an IAM programme, it is worth exploring.