CVE-2025-34257: Advantech WISE-DeviceOn Server · XSS or 'Cross-site Scripting'
Affects Advantech WISE-DeviceOn ServerSource CVE Database V5
Not known to be exploited · CVSS 5.1 Medium : upgrade to 5.4 when convenient.
Data as of 26 Oct 2026, 06:26 UTC
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 17% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 5.4
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 5 Dec 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.
What to do
Upgrade Advantech WISE-DeviceOn Server to 5.4.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Advantech Co., Ltd. WISE-DeviceOn Server | Affected
| Fixed in
|
AI-suggested
If you cannot patch yet, restrict authenticated user privileges to trusted users only and avoid viewing untrusted task entries.
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.
References
- advcloudfiles.advantech.com/cms/2ca1b071-fd78-4d7f-8a2a-7b4537a95d19/Security%20Advisory%20PDF%20File/SECURITY-ADVISORY----DeviceOn-20251208-2.pdf (opens in a new tab)
- docs.deviceon.advantech.com/docs/resource/ (opens in a new tab)
- vulncheck.com/advisories/advantech-wise-deviceon-server-authenticated-stored-xss-via-action-defined (opens in a new tab)