CVE-2026-27678
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedDue to missing authorization checks in the SAP S/4HANA backend OData Service (Manage Reference Structures), an attacker could update and delete child entities via exposed OData services without proper authorization. This vulnerability has a high impact on integrity, while confidentiality and availability are not impacted.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceThis is an Insecure Direct Object Reference (IDOR) vulnerability in SAP S/4HANA's OData Service for Manage Reference Structures. The service fails to perform authorization checks before allowing updates or deletions of child entities, enabling attackers to modify or delete data they shouldn't have access to through exposed OData endpoints.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Confirm SAP S/4HANA installationIdentify if your environment runs SAP S/4HANA by checking SAP kernel version (sapkernel -V) or consulting SAP system information transaction SM51Affected if SAP S/4HANA is present in the environment
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Verify OData Service for Manage Reference Structures is activeCheck if the OData service /sap/opu/odata/sap/API_MANAGE_REFERENCE_STRUCTURES_SRV is registered and active using transaction /IWFND/MAINT_SERVICE or OData metadata endpointAffected if The Manage Reference Structures OData service is registered and accessible
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Identify exposed OData endpointsAccess the OData metadata document at /sap/opu/odata/sap/API_MANAGE_REFERENCE_STRUCTURES_SRV/$metadata and review EntitySet and FunctionImport definitions for Update and Delete operations on child entitiesAffected if Update and Delete operations on child entities are exposed via the OData interface
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Check authorization role assignments for OData service usersReview user role assignments using transaction PFCG or SU01 to determine which roles grant access to the Manage Reference Structures OData service, specifically checking for authorization objects related to child entity modificationAffected if Users without proper explicit permissions for child entity modification have access to the OData service endpoints
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Test for IDOR by attempting unauthorized child entity modificationUsing a low-privilege user account with access to the OData service, attempt to update or delete a child entity belonging to a different reference structure using the PATCH or DELETE endpoints with directly referenced entity keysAffected if A user can modify or delete child entities they do not own or have explicit permission to access
Your environment is affected if SAP S/4HANA is running with the Manage Reference Structures OData service enabled and users can modify child entities they do not have explicit authorization for through exposed OData endpoints.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataImplement proper authorization validation on all OData service operations to ensure users can only modify/delete child entities they have explicit permissions for. Apply SAP security notes/patches for OData authorization and verify role-based access controls are correctly configured.
- Consultation4.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-27678 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-27678 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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