What’s Vulnerable › Vulnerabilities

CVE-2025-34266: Advantech WISE-DeviceOn Server < 5.4 Authenticated Stored XSS via plugin-config/addins/menus

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-05 · updated 2026-10-15
• Weakness: CWE-79

Description

Advantech WISE-DeviceOn Server versions prior to 5.4 contain a stored cross-site scripting (XSS) vulnerability in the /rmm/v1/plugin-config/addins/menus endpoint. When an authenticated user adds or edits an AddIns menu entry, the label and path values are stored in plugin configuration data and later rendered in the AddIns UI without proper HTML sanitation. An attacker can inject malicious script into either field, which is then executed in the browser context of users who view or interact with the affected AddIns entry, potentially enabling session compromise and unauthorized actions as the victim.

Affected products

• Advantech Co., Ltd. WISE-DeviceOn Server: before 5.4 — fixed in 5.4

How to fix

Upgrade to a fixed version: Advantech Co., Ltd. WISE-DeviceOn Server 5.4. Check the vendor advisory for mitigations.

References

• https://advcloudfiles.advantech.com/cms/2ca1b071-fd78-4d7f-8a2a-7b4537a95d19/Security%20Advisory%20PDF%20File/SECURITY-ADVISORY----DeviceOn-20251208-2.pdf
• https://docs.deviceon.advantech.com/docs/resource/
• https://www.vulncheck.com/advisories/advantech-wise-deviceon-server-authenticated-stored-xss-via-pluginconfig-addins-menus

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