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Deserialization of Untrusted DataWeakness · CWE-502

CVE-2026-27685

CRITICAL · 9.1 CVSS v3.1 Published 2026-03-10
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
97/100
Remediation priority · Urgent
Remotely reachable Zero-click

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 · unedited
SAP NetWeaver Enterprise Portal Administration is vulnerable if a privileged user uploads untrusted or malicious content that, upon deserialization, could result in a high impact on the confidentiality, integrity, and availability of the host system.

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 confidence

SAP NetWeaver Enterprise Portal Administration contains an insecure deserialization vulnerability where a privileged user can upload untrusted or malicious serialized content. Upon deserialization, this content executes with elevated privileges, compromising the confidentiality, integrity, and availability of the host system.

MitigationRestrict administrative user privileges to最小必要原则, implement strict content-type and payload validation on file uploads, and apply SAP security patches as they become available.

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
Low
Privileges
High
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify if SAP NetWeaver Enterprise Portal is installed
    Check for SAP NetWeaver components by reviewing installed software, running processes (look for 'SAP J2EE Engine', 'SAP Enterprise Portal'), or accessing the portal URL (typically on ports 5xx00 or 8000). Check system inventory or consult SAP LMAD for installed components.
    Affected if The system runs SAP NetWeaver Enterprise Portal software.
  2. Determine the SAP NetWeaver version
    Access SAP NWA (NetWeaver Administrator) at /nwa, or check SAP LMAD (Landscape Manager) for installed product versions. Compare the installed version against any SAP security notes or contact SAP support for version-specific vulnerability status.
    Affected if The installed SAP NetWeaver Enterprise Portal version falls within the affected range (if SAP publishes one).
  3. Verify Administration interface accessibility
    Attempt to access the SAP Enterprise Portal Administration console (typically at /irj/portal or /admin). Check if unauthenticated or low-privilege access is possible by reviewing access logs and portal security configuration.
    Affected if The Administration interface is accessible to users with elevated privileges who can use the file upload functionality.
  4. Inspect file upload configuration in Administration
    Within SAP Enterprise Portal Administration, navigate to System Administration > System Configuration > Server Configuration > Runtime. Review file upload settings, Content-Type validation rules, and whether upload of serialized objects (Java serialized data, .ser files) is restricted.
    Affected if File upload for serialized content types is enabled and no strict validation exists on uploaded files.
  5. Review user privilege assignments for upload capabilities
    In SAP EP, go to User Administration > Users and Roles. Identify users assigned to the 'Administrator' role or roles with 'Upload' or 'File Repository' permissions. Check if least-privilege principles are applied to these assignments.
    Affected if Users with elevated privileges (Administrator role) have file upload capabilities and no additional upload restrictions are configured.

A user is affected if their environment runs SAP NetWeaver Enterprise Portal with an Administration interface that permits privileged users to upload serialized content without strict validation.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Restrict administrative user privileges to最小必要原则, implement strict content-type and payload validation on file uploads, and apply SAP security patches as they become available.

Have this fixed Scoped from the published advisory
  • Consultation8.0 h
  • Implementation16.0 h
  • Testing12.0 h
  • Review / QA8.0 h
44.0 hours of engineering $7,720
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-27685 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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