CVE-2025-34236: Advantech Webaccess/vpn

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

Advantech WebAccess/VPN versions prior to 1.1.5 contain a stored cross-site scripting (XSS) vulnerability via NetworksController.addNetworkAction(). Insufficient validation or escaping of user-supplied input may allow an attacker to inject and execute arbitrary script in the context of a victim's browser.

Affected products

• Advantech Webaccess/vpn: before 1.1.5 (fixed in 1.1.5)

Published 2025-11-06. Last modified 2026-10-07.