CVE-2025-34265: 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, 08:30 UTC
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 9% 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 26 Oct 2026.
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 access to the rule creation and update functionality to trusted users only and consider monitoring for suspicious activity related to rule modifications.
Description
Advantech WISE-DeviceOn Server versions prior to 5.4 contain a stored cross-site scripting (XSS) vulnerability in the /rmm/v1/rule-engines endpoint. When an authenticated user creates or updates a rule for an agent, the rule fields min, max, and unit are stored and later rendered in rule listings or detail views without proper HTML sanitation. An attacker can inject malicious script into one or more of these fields, which is then executed in the browser context of users who view or interact with the affected rule, 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-rulesengine (opens in a new tab)