Secrets sprawl increases risk because credentials end up scattered across servers, files, and environments, which makes them easier to lose, harder to rotate, and more likely to be left behind after changes. A centralized secret manager reduces that drift by giving teams one controlled place to store, retrieve, and govern secrets across systems.
Why Secrets Sprawl Is More Dangerous Than One Managed Vault
Centralising credentials can reduce drift, but secrets sprawl creates a different kind of risk: it multiplies the number of places an attacker or insider can find usable access. Once secrets are copied into CI pipelines, ticketing systems, shared notes, host files, and containers, governance becomes inconsistent and revocation becomes incomplete. NHIMG’s Guide to the Secret Sprawl Challenge frames this as an identity hygiene problem as much as a storage problem.
The issue is not only exposure, but persistence. A single vault can be monitored, rotated, and audited; scattered secrets tend to survive long after the service account, deployment, or integration that created them has changed. That is why guidance from the NIST Cybersecurity Framework 2.0 on asset governance matters here, even though it is not secrets-specific. If teams cannot enumerate where a secret lives, they cannot prove who can use it or when it should expire. In practice, many security teams discover secret sprawl only after a leaked token has already been reused across multiple systems.
How Centralisation Changes the Control Model
A central secret manager reduces risk when it becomes the authoritative source for issuance, storage, access policy, and rotation. The point is not merely to “put secrets in one place,” but to make every consumer retrieve secrets just in time, with logging and expiration attached. That is also why the OWASP Non-Human Identity Top 10 is relevant: machine identities and their secrets should be governed as active access paths, not static configuration files.
Operationally, stronger programs separate three layers:
- storage, where the secret is encrypted and inventoried;
- distribution, where access is mediated by policy and short-lived retrieval;
- rotation, where credentials are replaced automatically when risk changes.
That design matters because sprawl usually begins when teams bypass the vault for convenience. A token hardcoded in a build step may feel temporary, but it becomes permanent the moment release automation, rollback scripts, and support runbooks depend on it. NHIMG’s Ultimate Guide to NHIs — Lifecycle Processes for Managing NHIs connects this to lifecycle governance: creation, use, rotation, and retirement need to be tracked together. These controls tend to break down in legacy estates where applications cache secrets locally and cannot call a manager at runtime.
GitGuardian’s State of Secrets Sprawl 2025 reports that 38% of secrets incidents in collaboration and project management tools are classified as highly critical or urgent, which shows how quickly “temporary” sharing channels become durable exposure paths. The practical lesson is that centralisation only works when teams stop cloning credentials into adjacent systems.
Where Sprawl Still Wins, and What to Watch For
Tighter centralisation often increases integration overhead, requiring organisations to balance control against delivery speed. That tradeoff is real in environments with many small services, offline jobs, or vendor integrations that cannot easily authenticate to a vault at request time. Current guidance suggests using a manager as the default and treating exceptions as time-bound, documented, and reviewed.
There is no universal standard for every exception pattern yet, but the common failure modes are clear. Long-lived fallback secrets, shared admin tokens, and environment-specific copies are the biggest problems because they undermine revocation. One leaked copy may be enough to keep access alive after the main credential is rotated. When teams operate across multiple clouds, ephemeral build runners, or air-gapped systems, the risk shifts from storage alone to inconsistent enforcement across boundaries. NHIMG’s Top 10 NHI Issues and the NIST control family in NIST SP 800-53 Rev 5 Security and Privacy Controls both support the same operational principle: inventory first, then limit exposure, then verify rotation actually reaches every copy. The model breaks down when teams assume central storage alone eliminates shadow copies in code, scripts, and third-party tools.
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, NIST SP 800-63 and NIST AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-03 | Addresses secret rotation and lifecycle control for non-human identities. |
| NIST CSF 2.0 | ID.AM | Secrets sprawl is fundamentally an asset inventory and governance problem. |
| NIST SP 800-63 | Digital identity guidance supports stronger authentication for secret retrieval workflows. | |
| NIST AI RMF | GOVERN | Governance is needed to make secret handling accountable across teams and tools. |
Inventory every machine secret, rotate it on schedule, and revoke stale copies immediately.
Related resources from NHI Mgmt Group
- Why do expired service credentials and exposed secrets create such a high lateral movement risk?
- Why do secrets create disproportionate risk in NHI environments?
- Why do shared vaults create risk when organisations rely on standing credentials for privileged access?
- Why do exposed cloud and API credentials create so much risk even when they look inactive?
