A technical RFC user is a non-human account used to call SAP Remote Function Call interfaces between systems or components. These accounts often have broad operational reach, so their permissions and network exposure must be governed as part of identity and trust management.
What a technical RFC user is
A technical RFC user is a non-human SAP account used to invoke Remote Function Call interfaces between systems or components. Because it often has system-wide reach, the account must be treated as a governed access path, not a convenience login.
Why technical RFC users exist
These accounts let backend systems exchange data and trigger functions without a person sitting in the session. In practice, they support integrations, batch processing, and cross-system automation where a human user would be the wrong execution model. The important distinction is that the account represents system-to-system trust, so its scope should match the business function it serves.
That makes the account architecture matter as much as the integration itself. A broad RFC user can become a hidden dependency across landscapes, especially when it is reused for multiple interfaces or granted permissions that exceed the specific function it needs.
How RFC users fit into identity and access control
Technical RFC users sit in the identity layer because they authenticate one component to another and carry permissions that determine what the calling system can do. In that sense, they belong alongside service accounts, interface accounts, and other machine credentials that need ownership, lifecycle management, and review.
The SAP RFC pattern is especially sensitive because the access path is often embedded in operational workflows. If the same account is shared across interfaces, rotated inconsistently, or exempted from normal review cycles, the result is usually weaker traceability and broader blast radius. For a general control baseline, organisations often map the design to NIST Cybersecurity Framework 2.0, NIST SP 800-53 Rev 5 Security and Privacy Controls, and the IETF-style protocol discipline of least trust and explicit interfaces, but the operational point remains the same: access must be deliberately bounded.
For readers comparing this with broader non-human identity guidance, the control concerns are the same class of problems seen in OWASP Non-Human Identity Top 10, especially overprivilege, secret handling, and lifecycle control. The difference is that RFC users are tied to SAP integration paths, so network exposure and interface trust boundaries are part of the identity decision, not just the application design.
How technical RFC users fail in practice
Failure usually starts when the account is made too powerful, too shared, or too persistent. A broad RFC user can mask which upstream system initiated an action, and a long-lived credential can survive beyond the interface or business process it was created for.
Another common issue is that technical convenience gets treated as authorization design. When teams use one account for many functions, or open network paths more widely than required, compromise of that account can expose a chain of backend actions rather than a single isolated transaction.
Risk and Threat Considerations
Technical RFC users create concentrated risk because they often sit on trusted system-to-system pathways with permissions that are broader than a typical human workflow. If the credential, host, or network path is exposed, an attacker may be able to reuse the account to call backend functions directly, bypassing normal user-facing controls.
Failure mechanism: Overprivileged or reused RFC credentials collapse multiple interface boundaries into one compromise point, and weak network restriction can make that point reachable from a larger attack surface.
Impact: Abuse of the account can lead to unauthorized data access, unintended business actions, integration tampering, or lateral movement across connected SAP components.
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 addresses the attack and risk surface, while NIST SP 800-53 Rev 5 and NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | IA-5 — Authenticator Management | RFC users depend on credential lifecycle and secret handling. |
| AC-6 — Least Privilege | RFC users often have broad backend permissions that should be minimized. | |
| Recommendation — Rotate RFC credentials, restrict reuse, and enforce secure authenticator lifecycle controls. Limit RFC user permissions to the exact functions each interface requires. | ||
| NIST CSF 2.0 | PR.AA-05 — Identity Management, Authentication, and Access Control | Technical RFC users are governed access paths that require explicit identity and access control. |
| Recommendation — Inventory RFC users and govern their authentication, authorization, and ownership. | ||
| OWASP Non-Human Identity Top 10 | NHI-05 — Overprivileged NHI | Technical RFC users are non-human accounts that can accumulate excessive privilege. |
| NHI-07 — Long-Lived Secrets | RFC users often rely on credentials that persist longer than the integration lifecycle. | |
| Recommendation — Reduce RFC user privilege to the minimum required for each SAP integration. Shorten credential lifetimes and remove stale RFC secrets when interfaces change. | ||
Practitioner Guidance
Governance implication: Assign clear ownership for each technical RFC user, tie it to a specific interface or business function, and review it as a distinct identity rather than as an anonymous technical dependency. That review should cover permissions, reachability, and whether the account still has a valid purpose.
What to watch for: Broad role assignment, shared credentials across multiple interfaces, and long-lived access that no longer matches the integration it was created for are strong signs that the account needs remediation. Treat those patterns as identity sprawl, not as harmless technical debt.
Related resources from NHI Mgmt Group
- What breaks when technical detections are not linked to user risk scoring?
- How should security teams use phishing assessments to improve user resilience without treating them as a technical pass or fail test?
- Why do data governance programs need clear user experience and adoption goals instead of relying only on technical features?
- When should organisations prioritise user training and third-party assessments alongside technical controls?