Why do unsafe custom code and risky transports create outsized security risk in SAP environments?

Why This Matters for Security Teams

Unsafe custom code and risky transports are dangerous in SAP because they can alter business logic, authorization checks, and data handling outside the standard package controls that teams assume are protecting production. Once a transport is approved, it may carry hidden privilege paths, weak validation, or exception logic that survives testing but fails security review. The result is control drift: the deployed system no longer matches the security model on paper.

This is especially important in SAP landscapes where change velocity, custom development, and cross-system dependencies make review discipline difficult to sustain. NHI Management Group has shown that confidence in identity security is often much lower than teams expect; in The State of Non-Human Identity Security, only 1.5 out of 10 organisations reported high confidence in securing NHIs. That same pattern appears in SAP change governance: the weakest link is often not the platform itself, but the unreviewed path into production. Current guidance from NIST Cybersecurity Framework 2.0 and Top 10 NHI Issues both point to disciplined control over change, privilege, and monitoring as foundational.

In practice, many security teams encounter SAP abuse only after a transport has already introduced a production weakness rather than through intentional preventive review.

How It Works in Practice

Custom code becomes risky when developers embed assumptions that bypass standard SAP safeguards, such as incomplete input validation, hardcoded logic, broad RFC access, or alternative execution paths that avoid normal approval flows. A transport is simply the delivery mechanism that can move those weaknesses into production quickly and at scale. Once that happens, the issue is no longer a single coding defect. It becomes an operational control failure because the production system may now expose privileges or data paths that security never intended to approve.

Practitioners should treat custom developments and transports as security-relevant change artifacts, not just application delivery items. That means reviewing code for authorization checks, looking for privileged function usage, testing for injection and data exposure, and validating that the transport contains only the intended objects. It also means tying change approval to traceable evidence, so reviewers can see who approved the change, what was tested, and whether compensating controls are in place. This aligns with the broader control emphasis in NIST SP 800-53 Rev 5 Security and Privacy Controls, especially where system integrity, least privilege, and monitoring are expected.

• Review custom ABAP or application logic for authorization bypass and unsafe data handling before transport approval.
• Restrict who can create, modify, and release transports, and require segregation between development and production authority.
• Validate transport content against the intended change scope to catch bundled or unintended objects.
• Log, monitor, and reconcile production changes so security can detect drift between approved and deployed state.

The SAP breach research published by NHI Management Group also illustrates how quickly hidden weaknesses become enterprise exposure when credentials, access paths, or control assumptions are not governed tightly; see SAP Breach and the broader Ultimate Guide to NHIs — Key Challenges and Risks. These controls tend to break down in fast-moving landscapes with frequent emergency transports because review, testing, and change reconciliation are routinely compressed or skipped.

Common Variations and Edge Cases

Tighter transport control often increases delivery overhead, requiring organisations to balance release speed against the risk of hidden production exposure. That tradeoff is real in SAP programs with heavy customisation, where business teams depend on rapid fixes and security teams need enough time to inspect code and dependencies.

There is no universal standard for every SAP environment yet, but current guidance suggests treating high-risk transports differently from routine maintenance. For example, security-sensitive changes may need deeper peer review, automated static analysis, and emergency release rules with post-deployment validation. In brownfield systems, the hardest cases are legacy custom modules with limited documentation, where teams cannot easily prove what a change will affect. In regulated environments, control drift matters even more because a transport can change both the technical state and the audit story at the same time. That is why the issue is broader than code quality alone. It is about preserving a trustworthy boundary between approved design and deployed reality, a point reinforced by the governance focus in Ultimate Guide to NHIs ? Why NHI Security Matters Now.

Practically, the edge cases appear when urgent fixes, third-party add-ons, or shared admin access reduce the time available for review. In those environments, teams should expect more drift unless transport governance is automated and independently verified.

Related resources from NHI Mgmt Group

• Why does a single point of access create outsized risk in enterprise environments?
• Why do non-human identities create audit risk in modern environments?
• Why do developer workstations create outsized risk for secrets and source code exposure in cloud environments?
• Why do install-time payloads in CI/CD environments create outsized risk for cloud and identity security?