# CVE-2025-34257

## Summary

- **CVE ID:** CVE-2025-34257
- **Severity:** MEDIUM
- **CVSS Score:** 5.1 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N)
- **CWE:** CWE-79
- **Published:** Dec 5, 2025
- **Last Modified:** Aug 14, 2026

## Description

Advantech WISE-DeviceOn Server versions prior to 5.4 contain a stored cross-site scripting (XSS) vulnerability in the /rmm/v1/action/defined endpoint. When an authenticated user creates a task, the defined_name value is stored and later rendered in the Overview page without HTML sanitization. An attacker can inject malicious script into defined_name, which is then executed in the browser context of users who view the affected task, potentially enabling session compromise and unauthorized actions as the victim.

## Affected Products

- Advantech Co., Ltd. — WISE-DeviceOn Server (0)

## References

- [CNA](https://advcloudfiles.advantech.com/cms/2ca1b071-fd78-4d7f-8a2a-7b4537a95d19/Security%20Advisory%20PDF%20File/SECURITY-ADVISORY----DeviceOn-20251208-2.pdf)
- [CNA](https://docs.deviceon.advantech.com/docs/resource/)
- [CNA](https://www.vulncheck.com/advisories/advantech-wise-deviceon-server-authenticated-stored-xss-via-action-defined)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.26%
- **EPSS Percentile:** 17.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._