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Vulnerabilities CVE-2025-34256

CVE-2025-34256

Critical
Open
TLP:CLEAR

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

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Description

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.

Details

CVSS Score
10.0
EPSS Score
0.68%

49.4th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Confidence
90%
Published
Dec 5, 2025
Last Modified
Aug 14, 2026
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