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Manage Reference StructuresApplication · Sap

CVE-2026-27679

MEDIUM · 6.5 CVSS v3.1 Published 2026-04-14
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
71/100
Remediation priority · Elevated
Remotely reachable Zero-click

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 · unedited
Due to missing authorization checks in the SAP S/4HANA frontend 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 confidence

SAP S/4HANA frontend OData Service (Manage Reference Structures) lacks proper authorization checks, allowing authenticated attackers to update or delete child entities through exposed OData endpoints without appropriate permissions. This is an Insecure Direct Object Reference (IDOR) vulnerability in the OData layer affecting data integrity.

MitigationApply SAP security patches for the affected OData service and implement proper authorization checks on the Manage Reference Structures endpoints, including validation of user permissions before allowing update/delete operations on child entities.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Manage Reference StructuresApplication
Affected:= uis4h_109

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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify SAP S/4HANA installation and version
    Query the SAP system for installed software components: use transaction SM37 or check SAP MII version via /n/iwfnd/maint_service (SAP Gateway OData exposure). Run ABAP report RS_COMPONENT_VERSION to list installed SAP components and their versions.
    Affected if The installed SAP S/4HANA version corresponds to component uis4h_109 for the Manage Reference Structures module.
  2. Locate Manage Reference Structures OData service
    Access SAP Gateway client (transaction /n/iwfnd/gw_client) and query the service catalog for services containing 'ManageReferenceStructures' or 'ReferenceStructure' in the name. Note the service name and technical service URL.
    Affected if The OData service for Manage Reference Structures is registered and exposed in the SAP Gateway.
  3. Verify OData service version
    In the SAP Gateway (transaction /n/iwfnd/maint_service), locate the Manage Reference Structures OData service metadata and check the version metadata. Alternatively, query the backend OData service metadata XML and look for version identifiers in the service document.
    Affected if The service metadata shows version uis4h_109.
  4. Confirm endpoint exposure
    Access the OData endpoint URL directly (e.g., /sap/opu/odata/sap/ManageReferenceStructures/) through a web browser or HTTP client. Verify if the endpoint responds with metadata or entity sets without requiring elevated privileges.
    Affected if The OData endpoint is reachable and exposes EntitySet definitions for child entities (e.g., ReferenceStructureChildren or similar).
  5. Test authorization on update/delete operations
    Using an authenticated but low-privilege user account, attempt OData POST/PATCH/DELETE requests to child entity endpoints (e.g., /sap/opu/odata/sap/ManageReferenceStructures/ChildEntities). Compare HTTP response codes: 200/204 indicates vulnerability, 403 indicates proper authorization.
    Affected if Low-privilege users can successfully update or delete child entities (HTTP 200/204) without receiving 403 Forbidden errors.

A user is affected if the Manage Reference Structures OData service is deployed at version uis4h_109 and permits update/delete operations on child entities without proper authorization enforcement.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply SAP security patches for the affected OData service and implement proper authorization checks on the Manage Reference Structures endpoints, including validation of user permissions before allowing update/delete operations on child entities.

Fix this in Manage Reference Structures Scoped from the published advisory
  • Consultation6.0 h
  • Implementation12.0 h
  • Testing10.0 h
  • Review / QA4.0 h
32.0 hours of engineering $5,580
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-27679 in production — separate from our analysis above.

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