CVE-2026-4769 json
Unauthenticated Access to Internal Diagnostic Interface
published 2026-07-13 3 mo ago modified 2026-07-13 3 mo ago also EUVD-2026-43297
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 55%
- public exploits
- 0
- none known
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 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.
Patch / fix
- WAGO 0765-110x/0100-0000 1.2.1.100
- WAGO 0765-120x/0100-0000 1.2.7.100
- WAGO 0765-150x/0100-0000 1.2.7.103
- WAGO 0765-2101/0100-0000 1.2.1.102
- WAGO 0765-2102/0100-0000 1.2.5.101
- WAGO 0765-410x/0100-0000 1.2.1.100
- WAGO 0765-420x/0100-0000 1.2.7.100
- WAGO 0765-450x/0100-0000 1.2.7.103
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 3 mo ago
Exploit prediction
0.76% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 4.0 | 9.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- WAGO 0765-110x/0100-0000
- WAGO 0765-120x/0100-0000
- WAGO 0765-150x/0100-0000
- WAGO 0765-2101/0100-0000
- WAGO 0765-2102/0100-0000
- WAGO 0765-410x/0100-0000
- WAGO 0765-420x/0100-0000
- WAGO 0765-450x/0100-0000
Classification
- Weakness
-
- CWE-912 Hidden Functionality
References
Sources
- CVE List CVE-2026-4769
- NVD CVE-2026-4769
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