Bring-your-own-vault is an integration model that lets an organisation keep using its existing secrets vault while connecting it to broader identity and privileged access controls. It preserves prior investment, but still requires consistent governance over storage, rotation, retrieval, and auditability.
Expanded Definition
Bring-your-own-vault is a deployment pattern for secrets management in which an organisation keeps its existing vault and connects it to identity, policy, and privilege controls rather than migrating secrets into a new platform. The model is often chosen when engineering teams already depend on a mature vault, or when a business wants to avoid the disruption of reissuing credentials, refactoring applications, and rebuilding rotation workflows. In NHI security, the term is used to describe an integration boundary, not a product category.
Definitions vary across vendors because some treat bring-your-own-vault as a migration strategy while others describe it as an orchestration layer. The practical distinction is whether the vault remains the system of record for storage and retrieval, while external controls govern authentication, authorization, rotation, and audit trails. That distinction matters because the vault may be technically preserved even as governance expectations change, which can create blind spots if the control plane is fragmented. For control mapping, teams often align the pattern with least privilege and secret lifecycle expectations in NIST SP 800-53 Rev 5 Security and Privacy Controls. The most common misapplication is assuming a connected legacy vault is automatically governed, which occurs when access policies are not revalidated after integration.
Examples and Use Cases
Implementing bring-your-own-vault rigorously often introduces integration complexity, requiring organisations to weigh existing platform investment against the cost of policy normalisation, telemetry stitching, and lifecycle enforcement.
- A security team connects a long-standing enterprise vault to a central identity layer so service accounts inherit consistent approval and revocation workflows.
- A platform engineering group keeps its current vault but overlays automated rotation and audit exports to reduce manual handling of API keys.
- An organisation uses its existing vault during an NHI modernisation effort, guided by patterns described in Guide to the Secret Sprawl Challenge, while standardising controls across multiple application teams.
- A cloud migration project retains the legacy secrets store temporarily, then gradually migrates high-risk workloads after validating whether secrets are static or dynamic using Ultimate Guide to NHIs — Static vs Dynamic Secrets.
- A compliance team keeps the vault in place but requires every retrieval event to flow into a SIEM so privilege use can be correlated with incident response evidence.
This model is most effective where application downtime is unacceptable and secret replatforming would be riskier than layering governance over the existing vault.
Why It Matters in NHI Security
Bring-your-own-vault matters because it can preserve operational continuity while still reducing secret sprawl, but only if the organisation treats the vault as part of a governed identity system rather than a standalone repository. NHIMG research shows that 62% of all secrets are duplicated and stored in multiple locations, which means legacy vault integrations can easily become another source of redundancy if retrieval patterns are not tightly controlled, as reflected in the 2025 State of NHIs and Secrets in Cybersecurity. A further risk is that onboarding a vault without security approval can introduce misconfigurations from the outset, undermining auditability and rotation discipline.
For practitioners, the main governance issue is that the vault may look centralized while actual secret usage remains dispersed across teams, pipelines, and workloads. That creates false confidence, especially when the integration stops at connectivity and does not extend to entitlement review or retrieval logging. Strong NHI programs use the model to reduce friction, not to excuse weak control design. Organisatons typically encounter hidden exposure only after a secret leak, at which point bring-your-own-vault governance becomes operationally unavoidable to address.
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 and CSA MAESTRO address the attack and risk surface, while NIST CSF 2.0, NIST SP 800-63 and NIST Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-02 | Addresses improper secret handling and vault-related exposure risk. |
| NIST CSF 2.0 | PR.AC-4 | Maps to access enforcement and privilege minimisation for secret systems. |
| NIST SP 800-63 | Identity assurance informs how humans and services authenticate to vaults. | |
| NIST Zero Trust (SP 800-207) | Applies zero trust principles to secret access paths and service trust decisions. | |
| CSA MAESTRO | Relevant where agentic workflows retrieve secrets from an existing vault. |
Require strong authentication for vault operators and service identities before allowing retrieval.
Related resources from NHI Mgmt Group
- How should security teams handle onboarding when customers bring their own identity provider?
- How should security teams govern vendor access in Bring Your Own Cloud deployments?
- Why does bring-your-own-cloud deployment matter for IAM automation?
- When does Azure Key Vault become insufficient on its own?
