---
id: CVE-2026-4769
title: >-
  Certain devices in the WAGO System I/O Field series activate an internal
  diagnostic capability during the initial startup sequence
summary: >-
  Certain devices in the WAGO System I/O Field series activate an internal
  diagnostic capability during the initial startup sequence. This functionality
  is not formally documented and becomes accessible without authentication for a
  brief p…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-912
published: '2026-07-13'
updated: '2026-07-13'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-4769'
references:
  - url: 'https://www.certvde.com/en/advisories/VDE-2026-031/'
    label: info@cert.vde.com
tags:
  - nvd
ingestedAt: '2026-07-13T11:26:50.764Z'
epss: 0.00757
epssPercentile: 0.53729
---

## Overview

Certain devices in the WAGO System I/O Field series activate an internal diagnostic capability during the initial startup sequence. This functionality is not formally documented and becomes accessible without authentication for a brief period in the early boot phase. During this window, an unauthenticated remote attacker can gain access to the internal system processes, resulting in full system compromise.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.