Should organisations patch first or rework SAP RFC authorisation first?

Why patching and RFC authorisation cannot be treated as separate fixes

Patch urgency addresses the known flaw, but SAP RFC exposure is often amplified by the way callable functions are authorised. If broad RFC permissions remain in place, a later weakness, misconfiguration, or newly discovered path can still reach high-value functions. The question is therefore not patch versus authorisation in isolation, but which control removes the most immediate and repeatable exposure.

In practice, patching first reduces the window for known exploitation, while authorisation review reduces the blast radius that survives the patch cycle. That is why the right sequence is usually urgent remediation first, followed by a disciplined review of which RFC destinations, function groups, and users actually need access.

What “rework RFC authorisation” really means in an SAP environment

RFC authorisation is not just a role-cleanup exercise. It is a review of whether the application is exposing callable business and technical functions more widely than intended, and whether those permissions reflect current operational need. If the authorisation concept is too coarse, users or technical accounts may retain reach into functions that should be isolated, limited, or split by business purpose.

That review typically has three parts: reduce callable surface area, separate sensitive functions from routine ones, and confirm that the access path is aligned to least privilege. It also means checking whether the same technical account, interface user, or integration user is being reused across multiple systems or environments, because that turns a local permission problem into a broader access problem.

A useful way to think about it is that patching closes one known door, while authorisation determines how many other doors still sit on the same hallway. If the hallway is wide open, the organisation can still face privilege abuse, lateral movement, or repeated exposure through another interface function.

How to prioritise the sequence without creating a false choice

Urgent patching is the first move when there is an exploitable weakness, confirmed exposure, or an active advisory. But the follow-up should begin immediately, not after a long delay. The authorisation review should focus on the callable RFC set that matters most to business operations, especially functions with system-level, cross-client, or privileged reach.

That review is strongest when it is driven by function use, not by role labels alone. A role that looks acceptable on paper can still grant broad runtime reach if it maps to too many RFC destinations or generic technical permissions. The practical outcome should be a smaller callable set, clearer ownership, and explicit approval for anything that remains broad because business operations truly require it.

Where possible, use this as a chance to separate emergency containment from structural remediation. Patching buys time, but the real resilience gain comes from ensuring that the next vulnerability cannot automatically inherit the same access path.

Risk and Threat Considerations

Broad RFC authorisation can turn a single product flaw into a repeatable compromise path. If callable functions are over-permissioned, an attacker does not need a new weakness every time; they only need one reachable function or one retained technical account with too much authority. That is why the residual risk can remain high even after the vulnerable component is patched.

Failure mechanism: The patch removes the known exploit path, but excessive RFC permissions preserve a structurally weak access model that can be reused by the next bug, misroute, or stolen credential.

Impact: Organisations may reduce immediate exposure yet still leave privileged business logic, sensitive transactions, or administrative functions reachable through the same overbroad trust relationship.

Practitioner Guidance

What to prioritise: Patch any confirmed or actively exploited SAP weakness first, then treat RFC authorisation as the containment layer that determines whether the same class of issue can recur with different inputs.

What to verify: Confirm which RFC destinations are actually callable, which technical users own them, and whether each permission still maps to a current business need rather than an inherited convenience.

Decision rule: If a function can invoke privileged behaviour, assume it deserves explicit scope reduction unless there is a documented operational reason to keep it broad.

Practitioner takeaway: The safe answer is not “patch or authorisation”, it is “patch now and remove the excess reach that would let the next issue bypass the fix.”

Related resources from NHI Mgmt Group

• Should organisations prioritise external exposure or internal credential governance first?
• How do organisations operationalise NHI ownership at scale?
• When should organisations treat an NHI as a high-priority risk?
• How can organisations reduce the blast radius of compromised agent identities?