CVE-2023-40731Network attack vector

Code tampering via unrestricted file uploads

Published Sep 12, 2023 · Updated Feb 27, 2025

Unrestricted file upload in Siemens IBS QMS Automotive before 12.39 allows remote authenticated users to tamper with code. The application's upload handling accepts arbitrary file types; Siemens does not disclose the endpoint or validation logic. Exploitation requires low-privileged application access and user interaction; Siemens reports code tampering, not code execution.

CVSS severity5.7
Medium
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in Siemens IBS QMS Automotive before 12.39 allows remote authenticated users to tamper with code. The application's upload handling accepts arbitrary file types; Siemens does not disclose the endpoint or validation logic. Exploitation requires low-privileged application access and user interaction; Siemens reports code tampering, not code execution.

The record

CVE
CVE-2023-40731
Published
Sep 12, 2023
Updated
Feb 27, 2025
Vendor
Siemens
Product
IBS QMS Automotive
Classifications
CWE-434, CAPEC-1, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 27, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=All versions < V12.39

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Siemens · IBS QMS Automotiveversion=All versions < V12.39

Published CVSS scores

5.7Siemens AGCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
CAPEC-1Accessing Functionality Not Properly Constrained by ACLs
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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