CVE-2026-40128
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 · uneditedSAP NetWeaver Application Server Java (Web Container) allows an unauthenticated attacker to craft a malicious HTTP logon request that manipulates file inclusion parameters, enabling path traversal and processing of the included file. Processing the included file could allow the attacker to view or modify sensitive information or render any part of the local system unavailable.
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 · high confidencePath traversal vulnerability in SAP NetWeaver Application Server Java Web Container allows unauthenticated attackers to manipulate file inclusion parameters in HTTP logon requests, enabling arbitrary file access that could expose sensitive information or cause denial of service.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
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
- High
- Privileges
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
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 checksWork through these to decide whether this CVE applies to you.
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Confirm SAP NetWeaver AS Java is runningIdentify SAP Java processes (e.g., jlaunch, java processes with SAP classpath) or check for SAP-specific ports (typically 5xx00 range for HTTP) using netstat or ssAffected if SAP NetWeaver AS Java processes are found listening on network ports
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Verify Web Container component is enabledCheck SAP LM configuration or review the deployed Web applications in the SAP NetWeaver Administrator (NWA) under Applications -> Web ApplicationsAffected if Web Container or servlet container is active and handling HTTP requests
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Determine installed SAP NetWeaver versionQuery the SAP system via SAP MII version info, check SAP Note or use SAP NWA under Operations -> System Overview -> Overview, or inspect the installed SAP JAR files for version metadataAffected if Installed version falls within unpatched release ranges for NetWeaver AS Java
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Inspect HTTP logon endpoint accessibilityAttempt a local curl or HTTP request to the logon endpoint (typically /logon or /saml/response paths) and verify whether unauthenticated requests reach the Web Container without authentication enforcementAffected if HTTP logon endpoint responds to unauthenticated requests without redirect to login
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Check network exposure of Web ContainerReview firewall rules, SAP ICM profile parameters (icm/server_port_*), or network ACLs to determine if the SAP HTTP ports are exposed beyond trusted internal networksAffected if Web Container HTTP ports (5xx00 range) are reachable from untrusted networks
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Review recent access logs for path traversal patternsExamine SAP Web Container access logs (located in the work directory) for abnormal logon requests containing ../ sequences or unusual file paths in query parameters
A system is affected if it runs unpatched SAP NetWeaver AS Java with the Web Container enabled and exposed, allowing unauthenticated path traversal via the HTTP logon endpoint.
Generated from the published advisory. Verify against your own configuration.
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 dataApply SAP security patches for CVE-2026-40128 immediately; restrict file system permissions and implement WAF rules to detect and block path traversal patterns in HTTP parameters.
- Consultation3.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,224.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-40128 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-40128 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data