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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 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.
This record: live connection— last retrieved: 7 November 2026 at 19:27.
Vendor
Published
13 July 2026
Last modified
13 July 2026
Taken directly from NVD, CISA or the vendor — sometimes in English, unchanged from the source.
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
NETWORK
Privileges required
NONE
User interaction
NONE
Confidentiality
High
Integrity
High
Availability
High
Probability of exploitation within 30 days
0.8%
Percentile
55e
Source: FIRST.org, updated on 7 November 2026.
Update to the listed fixed versions of the affected firmwares: | Fixed Version | Product Name | | ------------- | ------------------------------------ | | 1.2.1.100 | I/O System Field 0765-110x/0100-0000 | | 1.2.7.100 | I/O System Field 0765-120x/0100-0000 | | 1.2.7.103 | I/O System Field 0765-150x/0100-0000 | | 1.2.1.102 | I/O System Field 0765-2101/0100-0000 | | 1.2.5.101 | I/O System Field 0765-2102/0100-0000 | | 1.2.1.100 | I/O System Field 0765-410x/0100-0000 | | 1.2.7.100 | I/O System Field 0765-420x/0100-0000 | | 1.2.7.103 | I/O System Field 0765-450x/0100-0000 |
Our own interpretation and context for the source data above.
IACS Radar assessment
Our own interpretation and context for this vulnerability — not an official source.
IACS Radar priority score
Based on CVSS 9.8, EPSS 0.8%, industrial relevance 55/100.
Combines CVSS, EPSS, KEV status, industrial relevance and exposure relevance — a complement to, not a replacement for, the individual scores below and above.
Conditions for exploitation
Operational impact & energy relevance
Possible loss of visibility of or control over the process upon successful exploitation.
Assessed as relevant to the energy sector based on: Vermeld in een officiële CISA ICS Advisory, wat directe relevantie voor industriële besturingssystemen bevestigt. Vendor "WAGO" is a known supplier of equipment for the energy sector.
Recommended defensive measures
Industrial relevance score
Classification is provisional; manual verification by an OT security analyst is recommended.
Classified by IACS Radar-analysepijplijn (geautomatiseerd) on 7 November 2026.
IEC 62443 mapping
Automatic IACS Radar assessment based on the reported CWE weakness classification; not an official certification statement.