# CVE-2025-34257: Advantech WISE-DeviceOn Server versions prior to 5.4 contain a stored cross-site scripting (XSS) vulnerability in the…

Source: https://junglewise.ai/threats/cve-2025-34257-advantech-wise-deviceon-server-versions-prior-to-5-4-contain-a  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-12-05  
License: CC BY 4.0 with a link back

CVE-2025-34257 · Severity: medium · CVSS 5.4 · Published 2025-12-05

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.

Technologies: [Advantech Wise-Deviceon Server](https://junglewise.ai/threats/technologies/wise-deviceon-server). Vendors: [Advantech](https://junglewise.ai/threats/vendors/advantech).

## Quick answers

**Is CVE-2025-34257 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-34257 being exploited in the wild.

**How severe is CVE-2025-34257?** Medium severity, with a CVSS score of 5.4, published 5 December 2025.

**Which products and versions are affected?** Advantech Wise-Deviceon Server. The advisory does not name versions.

**Is there a fix for CVE-2025-34257?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2025-34257?** Check whether you run Advantech Wise-Deviceon Server. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Advantech Wise-Deviceon Server

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