Security readout for executives and security teams
Plain-English summary
An authenticated user can save a malicious schedule name in WISE-DeviceOn Server before version 5.4. When another user views or interacts with that schedule, the browser may execute the stored script, potentially exposing the victim’s session or enabling actions with the victim’s permissions.
Executive priority
Prioritize remediation in the normal vulnerability cycle, accelerating systems exposed to untrusted authenticated users or used by privileged administrators. The moderate severity does not indicate an unauthenticated takeover, but successful exploitation could compromise sessions and enable unauthorized actions under a victim’s identity.
Technical view
The /rmm/v1/action/schedule endpoint stores schedule names without adequate HTML sanitation and later renders them in schedule listings. Exploitation requires authenticated access, adding a schedule to an existing task, and victim interaction. The issue is CWE-79 with CVSS 4.0 score 5.1.
Likely exposure
WISE-DeviceOn Server deployments earlier than 5.4 are potentially exposed. Practical risk depends on whether untrusted or compromised authenticated accounts can create schedules and whether more-privileged users subsequently view them. The bundle’s structured affected-version entry is inconsistent, so confirm applicability against Advantech’s advisory.
Exploitation context
The supplied sources do not establish active exploitation, and the CVE is not listed as KEV in the bundle. Exploitation is network-accessible but requires low-privileged authentication and victim interaction, limiting opportunistic abuse while preserving meaningful insider or compromised-account risk.
Researcher notes
The stated vector is 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. The vulnerable data flow is authenticated schedule-name input, persistent storage, then unsafe browser rendering. Availability impact is not claimed. The structured affected field lists version “0” with default unaffected, conflicting with the narrative “prior to 5.4.”
Mitigation direction
- Confirm the deployed WISE-DeviceOn Server version and review Advantech’s advisory.
- Upgrade affected installations to version 5.4 or later using vendor guidance.
- Restrict schedule-creation permissions to trusted accounts until remediation is complete.
- Review existing schedule names and remove suspicious entries through supported administrative procedures.
Validation and detection
- Verify production and recovery environments report WISE-DeviceOn Server 5.4 or later.
- Confirm only intended accounts can add schedules to existing tasks.
- Review schedule creation and modification records for unexpected names or account activity.
- Validate in a safe test environment that schedule names render as text, not executable HTML.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
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.
Open ATT&CK lookupCVE-2025-34260 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- 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
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.
SSVC decision data
CVSS vector scores
1 official scoreWe 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.
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——VulnCheckVulnerability scoring details
Base CVSS 4.0 score
5.1MediumVector: 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
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://advcloudfiles.advantech.com/cms/2ca1b071-fd78-4d7f-8a2a-7b4537a95d19/Security%20Advisory%20PDF%20File/SECURITY-ADVISORY----DeviceOn-20251208-2.pdfCVE reference, VulnCheck · vendor-advisory, patch
- https://docs.deviceon.advantech.com/docs/resource/CVE reference, VulnCheck · product
- https://www.vulncheck.com/advisories/advantech-wise-deviceon-server-authenticated-stored-xss-via-action-scheduleCVE reference, VulnCheck · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.