CVE-2026-23687
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 ABAP and ABAP Platform allows an authenticated attacker with normal privileges to obtain a valid signed message and send modified signed XML documents to the verifier. This may result in acceptance of tampered identity information, unauthorized access to sensitive user data and potential disruption of normal system usage.
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 · moderate confidenceThis vulnerability in SAP NetWeaver ABAP allows an authenticated attacker with normal user privileges to obtain valid signed messages and subsequently modify XML documents while preserving valid digital signatures. This represents a signature validation bypass that enables attackers to inject tampered identity information into signed XML communications.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 700= 701= 702= 731= 740= 750= 751= 752= 753= 754= 755= 756CVSS 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
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/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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Identify installed SAP Basis versionExecute transaction SM37 or use SAP MYSAPSSY; alternatively, check via SAP JVM version or ABAP kernel patch level using report SAPCV; also check SAP system information via transaction System > StatusAffected if The installed SAP Basis version matches any of: 700, 701, 702, 731, 740, 750, 751, 752, 753, 754, 755, or 756
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Determine if XML digital signature functionality is in useReview custom ABAP code and SAP workflows that process signed XML documents; check for usage of standard SAP XML signature libraries or custom implementations using classes like CL_XML_SECURITY or CL_XML_DOCUMENT; search repository for signature-related method callsAffected if The system processes or validates digitally signed XML documents using ABAP XML security functionality
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Verify XML signature validation logicExamine ABAP code responsible for signature verification, specifically methods that parse and validate XML signatures; check if the validation logic properly enforces integrity checks after signature verification completesAffected if The signature validation implementation does not re-verify XML content integrity after initial signature processing or relies solely on the signature without additional integrity validation
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Test signature with modified XML contentObtain a valid signed XML message from the system, modify non-signature elements within the XML payload (such as identity fields or transaction data), then attempt to validate the signature using the same verification method the system usesAffected if Modified XML content passes signature validation while the XML structure has been altered from the originally signed state
The environment is affected if it runs any of the listed SAP Basis versions AND processes signed XML documents where tampered content can retain a valid signature.
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 relevant SAP Security Notes to address XML signature validation bypass; verify that digital signature verification properly rejects modified content and implement additional integrity checks for signed XML documents.
- Consultation6.0 h
- Implementation12.0 h
- Testing16.0 h
- Review / QA8.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $11,520.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-23687 — 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-2026-23687 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