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CVE-2026-40128 – Path Traversal / Local File Inclusion – SAP NetWeaver Application Server Java (W…

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Summary

CVE-2026-40128 is a critical path traversal vulnerability (CWE-35) affecting SAP NetWeaver Application Server Java (Web Container), version ENGINEAPI 7.50. An unauthenticated, remote attacker can craft a malicious HTTP logon request to manipulate file inclusion parameters, enabling path traversal and arbitrary local file processing on the underlying system. The vulnerability carries a CVSS v3.1 base score of 9.0 (Critical) with Changed Scope, meaning successful exploitation can extend impact beyond the vulnerable component itself.

Technical details

  • Root cause: Insufficient validation of file inclusion parameters in the SAP NetWeaver AS Java Web Container’s HTTP logon request handling, classified as CWE-35 (Path Traversal: '.../...//').
  • Trigger conditions: An attacker sends a specially crafted HTTP logon request with manipulated file path parameters to the publicly exposed SAP NetWeaver AS Java Web Container endpoint. No authentication, user interaction, or special privileges are required.
  • Attack vector: Network-accessible; the SAP NetWeaver AS Java logon interface is commonly exposed over HTTP/HTTPS, making internet-facing deployments directly reachable.
  • Impact: Successful exploitation can allow the attacker to read or modify sensitive files on the local system (Confidentiality: High, Integrity: High) or render any part of the local system unavailable (Availability: High). The Changed Scope (S:C) metric indicates impact can propagate to components beyond the vulnerable Web Container itself.

Affected software

  • SAP NetWeaver Application Server Java (Web Container) — ENGINEAPI 7.50

Severity

  • CVSS v3.1 Base Score: 9.0 (Critical)
  • Vector String: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Note: Attack Complexity is rated High (AC:H), which may require specific conditions to be met. Organizations running affected configurations should treat this as high priority given the severity of potential impact.

Mitigation and recommended actions

  • Immediate action: Apply SAP Security Note 3727078, released as part of SAP Security Patch Day (June 2026), which addresses this vulnerability. Access the note via the SAP Support Portal at https://me.sap.com/notes/3727078 (SAP login required).
  • If patching is not immediately feasible: Restrict network access to SAP NetWeaver AS Java logon endpoints at the perimeter (firewall or reverse proxy rules) to limit exposure to trusted networks only. Ensure that the SAP NetWeaver AS Java Web Container is not directly accessible from the public internet until the patch is applied.
  • Monitor SAP’s official Security Patch Day channel for any updates or additional guidance.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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