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Improper Signature VerificationWeakness · CWE-347

CVE-2026-24032

HIGH · 7.3 CVSS v3.1 Published 2026-04-14
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
82/100
Remediation priority · High
Remotely reachable No privileges 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
A vulnerability has been identified in SINEC NMS (All versions < V4.0 SP3 with UMC). The affected application contains an authentication weakness due to insufficient validation of user identity in the UMC component. This could allow an unauthenticated remote attacker to bypass authentication and gain unauthorized access to the application. (ZDI-CAN-27564)

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 confidence

This is an authentication bypass vulnerability in the UMC (User Management Component) of Siemens SINEC NMS. The application fails to properly validate user identity, allowing unauthenticated remote attackers to bypass authentication and gain unauthorized access to the system through insufficient validation of user credentials in the UMC component.

MitigationUpgrade SINEC NMS to version V4.0 SP3 or later which contains the fix for the authentication weakness in the UMC component.

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
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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. Verify SINEC NMS installation
    Check if Siemens SINEC NMS is installed on the system by looking for the installation directory, service, or product-specific files (typically under C:\Program Files\Siemens\SINEC or similar paths). Use 'Get-Service' or check Windows Programs and Features for SINEC NMS.
    Affected if SINEC NMS is installed and the version is before V4.0 SP3
  2. Determine installed version
    Locate the version information for SINEC NMS. Check the application's About page, installation logs, or version files in the installation directory. Compare the version number against V4.0 SP3.
    Affected if The installed version is any version prior to V4.0 SP3 (e.g., V4.0, V4.0 SP1, V4.0 SP2, or earlier)
  3. Check if UMC component is accessible
    Identify whether the User Management Component (UMC) is enabled and exposed. Inspect the SINEC NMS configuration files or web interface to determine if UMC is accessible via network services or web ports (typically ports 443 or 8080 for the web interface).
    Affected if UMC is enabled and reachable over the network without requiring authentication
  4. Verify UMC authentication configuration
    Examine the UMC configuration files or settings within SINEC NMS to inspect how user credential validation is configured. Look for settings related to authentication, session management, or user validation in the UMC component.
    Affected if The UMC component shows weak or missing credential validation (e.g., authentication can be bypassed or skipped)

A system is affected if Siemens SINEC NMS with UMC enabled is installed at a version before V4.0 SP3 and the UMC component is accessible without proper authentication controls.

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.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade SINEC NMS to version V4.0 SP3 or later which contains the fix for the authentication weakness in the UMC component.

Recommended fix Moderate confidence

V4.0 SP3

  1. Verify current SINEC NMS version by checking the installed version in the system
  2. Ensure the system meets prerequisites for upgrading to V4.0 SP3
  3. Download SINEC NMS V4.0 SP3 or later from the official Siemens download portal (cert-portal.siemens.com or Siemens Industry Online Support)
  4. Back up the current SINEC NMS configuration and database
  5. Perform the upgrade to V4.0 SP3 following the Siemens upgrade documentation
  6. After upgrade, verify that UMC component is properly integrated and authentication is functioning correctly

Generated from the published advisory — verify against the referenced sources before acting.

Have this fixed Scoped from the published advisory
  • Consultation8.0 h
  • Implementation16.0 h
  • Testing8.0 h
  • Review / QA4.0 h
36.0 hours of engineering $6,400
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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-2026-24032 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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