Vault Sprawl

Expanded Definition

Vault sprawl describes the drift from a deliberate, centralised secrets architecture into a patchwork of vaults, secret managers, environment-specific stores, and duplicated repositories. In NHI operations, that usually means no single system can confidently answer where a secret resides, which copy is authoritative, or who owns rotation. Guidance varies across vendors because some define sprawl by the number of vault instances, while others focus on duplicated credentials, unmanaged repositories, or policy fragmentation.

That ambiguity matters. A team may believe it has “modernised” by adding a new vault for a platform or business unit, but if legacy stores remain active, the organisation has only added another control plane. The result is often conflicting RBAC, inconsistent JIT workflows, and broken audit trails for Secrets that should be governed under a single lifecycle. For operational framing, NIST Cybersecurity Framework 2.0 is useful because it emphasizes asset visibility, protective controls, and continuous governance rather than merely where a secret is physically stored. The most common misapplication is treating each new vault as a clean replacement when the old secret repositories, replicas, and access paths are still live.

Examples and Use Cases

Implementing vault consolidation rigorously often introduces migration and governance overhead, requiring organisations to weigh faster platform adoption against the cost of inventorying, reissuing, and decommissioning every duplicated secret.

• A platform team deploys a new secrets manager for Kubernetes workloads, but application teams continue storing API keys in CI pipelines and shared drive exports. The organisation now has parallel sources of truth.
• An M&A integration brings in a second vault with different approval logic and rotation schedules. Without a single ownership model, the combined estate becomes hard to audit and even harder to retire safely.
• A developer reuses a token from one environment in another because the original vault is slow to access. That shortcut turns a local exception into a cross-environment exposure risk, a pattern discussed in the Guide to the Secret Sprawl Challenge.
• Security operations discovers that one credential is stored in a vault, copied into a ticketing system, and checked into code history. This is not just poor hygiene, it is duplicate secret governance failure, consistent with the concerns raised in Ultimate Guide to NHIs — Key Challenges and Risks.
• A secrets team adopts dynamic rotation for some workloads but leaves static secrets in older stores because the application cannot yet support renewal. That hybrid state is workable only when ownership, expiry, and fallback rules are explicit, as described in Ultimate Guide to NHIs — Static vs Dynamic Secrets.

Why It Matters in NHI Security

Vault sprawl weakens NHI security because control breaks down exactly where secrets need the most discipline: issuance, storage, rotation, revocation, and auditability. When secret copies multiply, incident response slows, and teams spend time proving which token or certificate is valid instead of revoking exposure quickly. That is especially dangerous in environments with shared NHIs, service accounts, and Agent access paths, where one leaked credential can cascade into multiple systems.

NHIMG research shows the scale of the problem: The 2025 State of NHIs and Secrets in Cybersecurity reports that 62% of all secrets are duplicated and stored in multiple locations. That duplication directly increases the odds of stale access, missed rotation, and accidental disclosure. Organisations that ignore the sprawl also tend to underinvest in central governance, which is why NIST-style control mapping and policy enforcement remain important even when different teams prefer different tooling. The practical takeaway is that vault count is not the metric that matters; authoritative ownership is. Organisations typically encounter the full cost of vault sprawl only after a leaked secret must be traced across several stores, at which point the term becomes operationally unavoidable to address.

Related resources from NHI Mgmt Group

• How should security teams reduce vault sprawl without disrupting delivery?
• When does vault sprawl become a real security risk?
• What is the difference between secrets sprawl and vault sprawl?
• What is secrets sprawl and why does it create security risk?