CVE-2026-89207: Siemens WTV676-HB6035 Web Interface

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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)

Published 2026-09-16. Last modified 2026-09-18.