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