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.
Official resources
CVE-2026-40128 was published on 2026-06-09T01:16:46.050Z and modified on 2026-06-09T02:08:28.150Z.