They should separate buying access from control ownership. A shared procurement framework can simplify acquisition, but each institution still needs explicit ownership for issuance, renewal, revocation and audit evidence. Without that separation, certificates can remain trusted long after the system, service or relationship they support has changed.
Why This Matters for Security Teams
Shared procurement can reduce duplication, but it does not remove accountability for certificate issuance, renewal, revocation, or evidence collection. The risk is that one buying process gets mistaken for one operating model. In practice, certificates outlive the service they protect, the team that requested them, or the vendor relationship that justified them. That is how shared trust becomes shared exposure.
NHI Management Group sees this pattern repeatedly in lifecycle failures where ownership is unclear. The issue is not procurement efficiency itself, but the lack of a control boundary between purchasing and administration. A certificate can be approved centrally and still require local ownership for runtime decisions. That separation is consistent with the lifecycle framing in the NHI Lifecycle Management Guide and with the audit concerns highlighted in Ultimate Guide to NHIs — Regulatory and Audit Perspectives. It also aligns with the control emphasis in the NIST Cybersecurity Framework 2.0, which expects governance, asset visibility, and timely response to be owned somewhere specific.
Without explicit ownership, institutions often discover certificate sprawl only when renewal fails, a service is disrupted, or an audit asks who can revoke what. In practice, many security teams encounter this only after a certificate expiry has already caused an outage rather than through intentional lifecycle review.
How It Works in Practice
The practical model is simple: centralise procurement, decentralise accountability. A shared buying arrangement can standardise approved issuers, preferred certificate profiles, and commercial terms, but each institution must still assign named control owners for issuance, renewal, revocation, key protection, and audit evidence. That owner should be the party with operational authority over the application or service, not just the entity that signed the purchasing agreement.
Current best practice is to treat certificate lifecycle management as an operating control with documented handoffs. That means the shared framework should define:
- Who requests the certificate and who approves the request
- Who owns the private key, the endpoint, and the service consuming the certificate
- Who monitors expiry, usage, and certificate chain validity
- Who revokes the certificate when the workload, vendor, or relationship changes
- What evidence is retained for audit and incident response
Institutions should also maintain a complete inventory of certificates mapped to systems and owners. That inventory is the difference between a procurement record and a security control. Research on machine identity operations shows why this matters: the Ultimate Guide to NHIs — Lifecycle Processes for Managing NHIs frames lifecycle discipline as a continuous control, while the OWASP Non-Human Identity Top 10 treats unmanaged non-human credentials as a direct security failure mode.
Vendor research reinforces the operational stakes: SailPoint reports that only 38% of organisations have automated certificate lifecycle management, and 59% say auditing machine identities is harder because of unclear ownership and limited visibility. That is why shared procurement should require each institution to maintain its own lifecycle register even when the buying channel is common. These controls tend to break down when one central team assumes it can manage renewals for systems it does not operate, because it cannot reliably see local service dependencies or business change windows.
Common Variations and Edge Cases
Tighter central governance often increases coordination overhead, so institutions have to balance standardisation against local operational control. That tradeoff becomes visible when a shared certificate platform supports multiple legal entities, business units, or third-party managed services.
There is no universal standard for this yet, but current guidance suggests a few practical variants. Some institutions use a central policy team to define acceptable certificate lifetimes and issuer standards, while business units retain revocation authority for their own systems. Others split duties by environment, with central oversight for production and local autonomy for development or testing. The key is that the model must be explicit enough to answer who can revoke, who can renew, and who can prove the certificate was still needed at the time of issuance.
Edge cases deserve special attention when certificates are embedded in shared platforms, managed service contracts, or outsourced operations. In those environments, procurement may be common, but evidence ownership is often fragmented. Institutions should require contract language that preserves revocation rights, logs renewal responsibility, and guarantees audit access. The Guide to NHI Rotation Challenges is relevant here because rotation and renewal failures often stem from the same ownership gap.
Where shared procurement breaks down most often is in multi-institution environments with different risk tolerances, because one renewal calendar cannot safely represent several separate accountability chains.
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 and NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-03 | Covers weak lifecycle control and stale non-human credentials. |
| NIST CSF 2.0 | PR.AC-4 | Supports least-privilege access and explicit authorization boundaries. |
| NIST CSF 2.0 | DE.CM-8 | Continuous monitoring is needed to detect expired or orphaned certificates. |
Separate procurement approval from operational control ownership and enforce least privilege at the service level.
