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TI-2025-24399 Aliases CVE-2025-34256GHSA-vqjp-fh8j-rf3j

Advantech WISE-DeviceOn Server < 5.4 Hard-coded JWT Key Authentication Bypass

Priority HIGH 82CWE-321Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-321.

Summary

Advantech WISE-DeviceOn Server versions prior to 5.4 contain a hard-coded cryptographic key vulnerability. The product uses a static HS512 HMAC secret for signing EIRMMToken JWTs across all installations. The server accepts forged JWTs that need only contain a valid email claim, allowing a remote unauthenticated attacker to generate arbitrary tokens and impersonate any DeviceOn account, including the root super admin. Successful exploitation permits full administrative control of the DeviceOn instance and can be leveraged to execute code on managed agents through DeviceOn’s remote management features.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00741 54th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed WISE-DeviceOn Server (Advantech Co., Ltd.): 5.4.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
AdvantechWISE-DeviceOn Serverbefore 5.4.05.4.0Patch availableCNA
  • WISE-DeviceOn Server VendorAdvantech Affected before 5.4.0 Fixed in 5.4.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:advantech:wise-deviceon_server:*:*:*:*:*:*:*:*before 5.4VulnerableAdvantech
  • cpe:2.3:a:advantech:wise-deviceon_server:*:*:*:*:*:*:*:* Versions before 5.4 Vulnerable ·Advantech

Remediation

  • Fix · CNA WISE-DeviceOn Server (Advantech Co., Ltd.) Fixed in 5.4.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Advantech WISE-DeviceOn Server — advcloudfiles.advantech.com/cms/2ca1b071-fd78-4d7f-8a2a-7b4…

    11 records Highest priority Priority HIGH 1 HIGH, 10 LOW

    Other records, highest priority first

    • TI-2025-24409 Advantech WISE-DeviceOn Server < 5.4 Authenticated Stored XSS via plugin-config/addins/menusPriority LOW 23
    • TI-2025-24408 Advantech WISE-DeviceOn Server < 5.4 Authenticated Stored XSS via rule-enginesPriority LOW 23
    • TI-2025-24407 Advantech WISE-DeviceOn Server < 5.4 Authenticated Stored XSS via dog/{agentId}Priority LOW 23
    Show all 11 records → Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-34256
  2. 2026-10-03 Alias added: GHSA-vqjp-fh8j-rf3j

References

Exploit 1

Patch 1

Other 1

  • TI-2025-24409 Advantech WISE-DeviceOn Server < 5.4 Authenticated Stored XSS via plugin-config/addins/menus CVSS 4.0MEDIUM 5.1
  • TI-2025-24408 Advantech WISE-DeviceOn Server < 5.4 Authenticated Stored XSS via rule-engines CVSS 4.0MEDIUM 5.1
  • TI-2025-24407 Advantech WISE-DeviceOn Server < 5.4 Authenticated Stored XSS via dog/{agentId} CVSS 4.0MEDIUM 5.1
  • TI-2025-24406 Advantech WISE-DeviceOn Server < 5.4 Authenticated Stored XSS via plugin-config/dashboards/menus CVSS 4.0MEDIUM 5.1
  • TI-2025-24405 Advantech WISE-DeviceOn Server < 5.4 Authenticated Stored XSS via devices/name/{agent_id} CVSS 4.0MEDIUM 5.1
  • TI-2025-24404 Advantech WISE-DeviceOn Server < 5.4 Authenticated Stored XSS via devicegroups/ CVSS 4.0MEDIUM 5.1
See all 10 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences