Accountability sits with the teams that own segmentation, application reachability, and SAP interface governance, not just the patch owner. If a trusted endpoint is reachable from user networks or external paths, the trust model has already failed. Security, Basis, and IAM owners need a shared view of which endpoints are privileged system interfaces.
Why This Matters for Security Teams
When a trusted SAP endpoint is reachable from the wrong network zone, the issue is no longer just patching. It becomes a question of segmentation, interface governance, and who is accountable for the path that made the endpoint usable in the first place. Under Zero Trust, trust is not granted because an endpoint is “internal”; it is continuously evaluated based on context and access path, as reflected in NIST SP 800-207 Zero Trust Architecture.
That matters because SAP interfaces often behave like privileged system identities: they can move data, trigger business logic, and expose downstream systems if they are reachable from user segments or external routes. NHI Management Group has repeatedly highlighted how exposed non-human identities become a systemic risk, including that Ultimate Guide to NHIs reports 97% of NHIs carry excessive privileges and 90% of IT leaders say proper NHI management is essential to Zero Trust. In practice, many security teams encounter this only after a trusted interface has already been abused from an unintended network path, rather than through intentional segmentation testing.
How It Works in Practice
Accountability should be split across the teams that control the full trust chain. Network and platform teams own the zone design and routing rules. SAP Basis or application owners own which interfaces must be reachable, by whom, and for what purpose. IAM and security engineering own authentication, service account governance, and whether the endpoint is treated as a privileged NHI rather than a generic application port. Current guidance suggests treating each SAP endpoint as a scoped workload identity with explicit reachability rules, not as a broadly trusted internal service.
Operationally, that means three controls must line up:
- Network segmentation must restrict the endpoint to approved source zones only.
- Authentication should use short-lived or tightly governed secrets, not long-lived shared credentials.
- Interface inventories should map each endpoint to an owner, business function, and approved dependency chain.
This is where NHI governance becomes practical. The Ultimate Guide to NHIs is clear that visibility and rotation gaps are common, which is why privileged SAP endpoints should be monitored like any other sensitive non-human identity. That aligns with NIST SP 800-207 Zero Trust Architecture, where resource access is continuously evaluated rather than assumed from location alone. In practice, this means logging source zone, calling identity, transaction intent, and interface owner for every privileged call. These controls tend to break down in legacy SAP landscapes with flat networks, shared service accounts, and undocumented RFC or API dependencies because the real trust boundaries are not visible.
Common Variations and Edge Cases
Tighter segmentation often increases operational friction, requiring organisations to balance security gain against release velocity and legacy integration cost. That tradeoff is especially acute in SAP environments where business-critical batch jobs, middleware, and third-party integrations may still depend on static routes or shared credentials. Best practice is evolving, and there is no universal standard for this yet, but the direction is consistent: treat network path, identity, and interface privilege as one control plane rather than separate problems.
Edge cases usually appear when an endpoint is technically internal but functionally exposed. Examples include jump-host access, VPN users placed into broad subnets, cloud-connected SAP integrations, or vendor-managed connections that bypass normal zoning. In those cases, “trusted endpoint” is a misleading label if the reachable source set is too wide. The right accountability question is not only who patched the service, but who approved the route, who owned the exception, and who validated the resulting blast radius. That is why shared ownership between Security, Basis, and IAM is necessary, with explicit sign-off on privileged interface exposure and periodic review of source-zone permissions.
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 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-03 | Covers exposure and governance of privileged non-human endpoints. |
| NIST CSF 2.0 | PR.AC-4 | Access restrictions should follow least-privilege and network segmentation. |
| NIST Zero Trust (SP 800-207) | Zero Trust requires continuous evaluation of access regardless of network location. |
Enforce source-zone controls and review trusted endpoint reachability against least privilege.
