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CVE Record

CVE-2025-34265: Advantech WISE-DeviceOn Server < 5.4 Authenticated Stored XSS via rule-engines

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.

MediumCVSS 5.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

An authenticated user can hide browser-executed content inside DeviceOn rule fields. When another user opens the affected rule, that content may run with the victim’s session, potentially exposing data or performing unauthorized actions. The attacker first needs a valid account with rule-management access, and the victim must interact with the stored rule.

Executive priority

Schedule remediation promptly, prioritizing environments where less-trusted users can manage rules or privileged administrators review them. The medium severity does not suggest an emergency shutdown, but stored XSS can cross privilege boundaries and turn one compromised account into broader session or administrative impact.

Technical view

WISE-DeviceOn Server versions earlier than 5.4 fail to properly sanitize the min, max, and unit fields submitted through /rmm/v1/rule-engines. Stored content is later rendered in rule listings or detail views, creating authenticated stored XSS. CVSS 4.0 is 5.1, with network access, low privileges, and passive user interaction required.

Likely exposure

Exposure is most likely where DeviceOn Server earlier than 5.4 permits low-trust or compromised authenticated accounts to create or update agent rules. Risk increases when administrators or higher-privileged users routinely view those rules. The supplied evidence does not establish how commonly affected servers are internet-accessible.

Exploitation context

The vulnerability requires authentication and subsequent interaction by another user, limiting opportunistic exploitation. Successful abuse could execute script in the victim’s browser context, enabling session compromise or unauthorized actions. The source bundle marks the CVE as absent from KEV and provides no evidence of active exploitation.

Researcher notes

The vulnerable data path is authenticated rule creation or update through /rmm/v1/rule-engines, followed by unsafe rendering in listings or detail views. Relevant fields are min, max, and unit. Evidence supports confidentiality and integrity impact across browser contexts, but not availability impact, unauthenticated access, widespread exposure, or observed exploitation.

Mitigation direction

  • Upgrade WISE-DeviceOn Server to version 5.4 or later, following the Advantech advisory.
  • Restrict rule creation and modification permissions to trusted accounts until upgrading.
  • Review existing rule fields for unexpected HTML or script-like content.
  • Revoke suspicious sessions and investigate affected accounts if malicious stored content is discovered.

Validation and detection

  • Inventory WISE-DeviceOn Server instances and confirm their installed versions.
  • Identify accounts and roles allowed to create or update agent rules.
  • Inspect min, max, and unit values in existing rules for anomalous markup.
  • After upgrading, confirm benign special characters render as text without browser execution.
Prepared
Confidence
high
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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cwe · medium confidence lookup

CWE-79: User-session and phishing behavior lookup

Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2025-34265 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.1 (4.0)
Known Exploited
No
Published

Vector: 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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
3Timeline events
1ADP providers
4Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
5.1CVSS 4.0MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N——VulnCheck

Vulnerability scoring details

Base CVSS 4.0 score

5.1Medium
CVSS 4.0 vector shape for CVE-2025-34265Attack VectorAttack ComplexityAttack RequirementsPrivileges RequiredUser InteractionVS ConfidentialityVS IntegrityVS AvailabilitySS ConfidentialitySS IntegritySS Availability

Vector: 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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Attack Requirements
NonePresent
Privileges Required
NoneLowHigh
User Interaction
NonePassiveActive
VS Confidentiality
HighLowNone
VS Integrity
HighLowNone
VS Availability
HighLowNone
SS Confidentiality
HighLowNone
SS Integrity
HighLowNone
SS Availability
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Advantech Co., Ltd.WISE-DeviceOn Server0unaffected
Weakness

CWE details

CWE-79

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-79 · source CWE mapping

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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