Is CVE-2026-40128 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-40128 being exploited in the wild.

How severe is CVE-2026-40128?

Critical severity, with a CVSS score of 9, published 9 June 2026.

Is there a fix for CVE-2026-40128?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-40128 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-40128?

Check whether you run SAP NetWeaver Application Server Java (Web Container). Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-40128: SAP NetWeaver AS Java path traversal in Web Container

CVE-2026-40128 · Severity: critical · CVSS 9 · Published 2026-06-09

SAP NetWeaver Application Server Java, a foundational platform for many SAP business applications, contains a critical security flaw in its web handling component. An unauthenticated attacker can send a specially crafted login request to access or modify sensitive internal files and potentially crash the system. This could lead to the theft of corporate data, unauthorized changes to business records, or a total disruption of SAP-dependent business processes.

Technologies: SAP NetWeaver Application Server Java (Web Container). Vendors: SAP.

Quick answers

Is CVE-2026-40128 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-40128 being exploited in the wild.
How severe is CVE-2026-40128?: Critical severity, with a CVSS score of 9, published 9 June 2026.
Which products and versions are affected?: SAP NetWeaver Application Server Java (Web Container).
Is there a fix for CVE-2026-40128?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-40128 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-40128?: Check whether you run SAP NetWeaver Application Server Java (Web Container). Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A path traversal vulnerability (CWE-35) exists in the Web Container of SAP NetWeaver Application Server Java. The flaw is triggered via manipulated file inclusion parameters within an HTTP logon request. An unauthenticated remote attacker can exploit this to include and process local files, potentially leading to the disclosure of sensitive information, unauthorized data modification, or a denial-of-service (DoS) condition. While the attack vector is network-based and requires no privileges, the CVSS assessment indicates high complexity, likely due to specific configuration requirements or the need for precise parameter manipulation. SAP has released security note 3727078 to address this issue.

Affected products

SAP NetWeaver Application Server Java (Web Container)

Timeline

2026-06-09: advisory: SAP Security Patch Day release
2026-06-09: disclosed: NVD publication date

References

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