PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-40128 SAP_SE CVE debrief

CVE-2026-40128 is a critical vulnerability in SAP NetWeaver Application Server Java (Web Container). An unauthenticated attacker can craft a malicious HTTP logon request to manipulate file inclusion parameters, enabling path traversal and processing of the included file. This could allow the attacker to view or modify sensitive information or render any part of the local system unavailable. The CVSS score for this vulnerability is 9, indicating a critical severity level.

Vendor
SAP_SE
Product
SAP NetWeaver Application Server Java (Web Container)
CVSS
CRITICAL 9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-09
Advisory published
2026-06-09
Advisory updated
2026-06-09

Who should care

Administrators and security teams responsible for SAP NetWeaver Application Server Java (Web Container) should be aware of this vulnerability and take immediate action to mitigate the risk.

Technical summary

The vulnerability exists in the Web Container of SAP NetWeaver Application Server Java. An attacker can exploit this vulnerability by crafting a malicious HTTP logon request that manipulates file inclusion parameters, leading to path traversal. The attacker could then process the included file, potentially gaining access to sensitive information or causing system unavailability.

Defensive priority

High

Recommended defensive actions

  • Apply the security patches provided by SAP as soon as possible. Refer to [ref-4](https://me.sap.com/notes/3727078) and [ref-5](https://url.sap/sapsecuritypatchday) for more information.
  • Implement additional monitoring and logging to detect potential exploitation attempts.
  • Restrict access to the SAP NetWeaver Application Server Java (Web Container) to only trusted users and networks.

Evidence notes

The CVE record [cve-org](https://www.cve.org/CVERecord?id=CVE-2026-40128) and NVD detail [nvd](https://nvd.nist.gov/vuln/detail/CVE-2026-40128) provide additional information about this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-40128 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-40128

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-40128 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-40128

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.