CVE-2026-4769Disclosure

LOWCVSS 9.3 · CRITICAL

Signal is active with 5 mentions in latest observed window

Immediate actions

Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

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.

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0.5/ 10 priority

Sources & remediation

Other references

https://www.certvde.com/en/advisories/VDE-2026-031/

Weakness type (CWE)

CWE-912

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Threat summary

Patch or workaround signal is available
5 mentions across 1 observed day

What's happening

Patch or workaround mentioned in 2 signals
Technical details provided in 4 signals
Disclosure: 3 classified signals
General: 1 classified signal
5 total mentions across 1 day

Deep dive

Activity timeline5 mentions / 1d

Signal classification3 categories

Disclosure

360.0%

General

120.0%

Patch

120.0%

Referenced assets2 URLs

By indicator

Full discourse5 posts

Daily CyberSecurity@Daily_CyberSec91d
Disclosure
CVE-2026-4769 exposes WAGO System I/O field devices. An early-boot flaw lets an unauthenticated attacker reach full system compromise. #WAGO #CVE20264769 #ICS #OTSecurity #Firmware http://securityonline.info/wago-system-io-cve-2026-4769/
Post summary
The tweet announces CVE‑2026‑4769 as an early‑boot vulnerability in WAGO System I/O devices that permits unauthenticated attackers to achieve full system compromise, without mentioning PoC, exploits, or patches.
01010379
12.5K followersView on X
Orizon@OrizonCyber91d
Patch
🚨 CVE-2026-4769 — CVSS 9.8/10 ██████████ Certain devices in the WAGO System I/O Field series activate an internal diagnostic capability during the initial... Severity: CRITICAL Patch now. #cybersecurity #CVE https://t.co/SWPcytstf9
Post summary
The tweet announces a critical CVE-2026-4769 with a CVSS of 9.8/10 and urges users to apply the vendor‑provided patch immediately.
1000084
66 followersView on X
ThreatWire@ThreatWire_91d
Disclosure
🚨 CVE-2026-4769: A critical vulnerability affecting WAGO System I/O devices could allow unauthenticated attackers to fully compromise affected systems through an early-boot flaw. #CyberSecurity #CVE #ICS #OT #ThreatWire
Post summary
The tweet announces a critical early‑boot vulnerability (CVE‑2026‑4769) in WAGO System I/O devices, indicating unauthenticated attackers could fully compromise affected systems, but it offers no PoC, exploit details, or patch information.
0001058
70 followersView on X
CVE@CVEnew91d
General
CVE-2026-4769 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 d… https://www.cve.org/CVERecord?id=CVE-2026-4769
Post summary
The CVE describes an internal diagnostic capability activation during the startup of certain WAGO System I/O Field devices, with no further technical or exploitation details provided.
00000643
57.8K followersView on X
Upwind Security MDR@UpwindMDR91d
Disclosure
🚨 CRITICAL - Unauthenticated early-boot diagnostic access in WAGO System I/O Field devices (CVE-2026-4769) Certain WAGO System I/O Field series devices expose an undocumented internal diagnostic function during initial startup, briefly reachable over the network without authentication. The issue stems from an insecure default/initialization state and improper access control during the boot sequence (authentication not enforced until later services come up). An unauthenticated remote attacker on the same reachable network can time requests during the early-boot window (e.g., right after power-cycle/reboot) to interact with internal system processes. If exploited, this can result in full device compromise, enabling remote control of the system and potential lateral movement or disruption of industrial operations. 👉 Affected: WAGO System I/O Field series devices (versions not specified; during initial startup/early-boot window) | Upgrade to Vendor fix (not specified) or disable/restrict network access and treat reboot events as high-risk until patched
Post summary
The text announces a critical early‑boot vulnerability in WAGO System I/O Field devices, explaining the technical issue and recommending a vendor fix or network restrictions.
0000098
247 followersView on X

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What researchers are saying

CVE-2026-4769

Orizon[verified]@OrizonCyberPatch

The tweet announces a critical CVE-2026-4769 with a CVSS of 9.8/10 and urges users to apply the vendor‑provided patch immediately.

Upwind Security MDR[verified]@UpwindMDRDisclosure

The text announces a critical early‑boot vulnerability in WAGO System I/O Field devices, explaining the technical issue and recommending a vendor fix or network restrictions.

Daily CyberSecurity@Daily_CyberSecDisclosure

The tweet announces CVE‑2026‑4769 as an early‑boot vulnerability in WAGO System I/O devices that permits unauthenticated attackers to achieve full system compromise, without mentioning PoC, exploits, or patches.

ThreatWire@ThreatWire_Disclosure

The tweet announces a critical early‑boot vulnerability (CVE‑2026‑4769) in WAGO System I/O devices, indicating unauthenticated attackers could fully compromise affected systems, but it offers no PoC, exploit details, or patch information.

CVE@CVEnewGeneral

The CVE describes an internal diagnostic capability activation during the startup of certain WAGO System I/O Field devices, with no further technical or exploitation details provided.