CVE-2026-89207

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-16 · updated 2026-09-18
Weakness: CWE-1287

Description

A vulnerability has been identified in WTV676-HB6035 Web Interface (All versions < V3.94), WTV776-HB6035 Web Interface (All versions < V4.17). Affected devices do not properly validate input received from backend services. This could allow an unauthenticated remote attacker to force the device into protection mode, which results in losing remote connectivity functions (Web Access).

Affected products

Siemens WTV676-HB6035 Web Interface: before V3.94 — fixed in V3.94
Siemens WTV776-HB6035 Web Interface: before V4.17 — fixed in V4.17

How to fix

Upgrade to a fixed version: Siemens WTV676-HB6035 Web Interface V3.94; Siemens WTV776-HB6035 Web Interface V4.17. Check the vendor advisory for mitigations.

References

https://cert-portal.siemens.com/productcert/html/ssa-823812.html

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