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CVE-2025-34256— Advantech WISE-DeviceOn Server < 5.4 Hard-coded JWT Key Authentication Bypass

Quick assessment

Affected
Advantech Co., Ltd. WISE-DeviceOn Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Advantech WISE-DeviceOn Server是中国台湾研华（Advantech）公司的一个物联网设备管理平台软件。 Advantech WISE-DeviceOn Server 5.4之前版本存在安全漏洞，该漏洞源于使用硬编码加密密钥，可能导致远程攻击者冒充任意账户。

CVSS 10.0 · Critical EPSS 0.68% · P50

Affected Version Matrix 1

VendorProduct Version RangeStatus
Advantech Co., Ltd. WISE-DeviceOn Server < 5.4.0 affected
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I. Basic Information for CVE-2025-34256

Vulnerability Information
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Vulnerability Title
Advantech WISE-DeviceOn Server < 5.4 Hard-coded JWT Key Authentication Bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
使用硬编码的密码学密钥
Source: CVE Program / CVE List V5
Vulnerability Title
Advantech WISE-DeviceOn Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Advantech WISE-DeviceOn Server是中国台湾研华（Advantech）公司的一个物联网设备管理平台软件。 Advantech WISE-DeviceOn Server 5.4之前版本存在安全漏洞，该漏洞源于使用硬编码加密密钥，可能导致远程攻击者冒充任意账户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Advantech Co., Ltd. WISE-DeviceOn Server 0 ~ 5.4.0 -

II. Public POCs for CVE-2025-34256

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III. Intelligence Information for CVE-2025-34256

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Security Blog Posts for CVE-2025-34256 (1)

Other References for CVE-2025-34256 (1)

Same Patch Batch · Advantech Co., Ltd. · 2025-12-05 · 11 CVEs total

CVE-2025-34260 5.1 MEDIUM Advantech WISE-DeviceOn Server < 5.4 Authenticated Stored XSS via action/schedule
CVE-2025-34261 5.1 MEDIUM Advantech WISE-DeviceOn Server < 5.4 Authenticated Stored XSS via devicegroups/
CVE-2025-34266 5.1 MEDIUM Advantech WISE-DeviceOn Server < 5.4 Authenticated Stored XSS via plugin-config/addins/men
CVE-2025-34264 5.1 MEDIUM Advantech WISE-DeviceOn Server < 5.4 Authenticated Stored XSS via dog/{agentId}
CVE-2025-34262 5.1 MEDIUM Advantech WISE-DeviceOn Server < 5.4 Authenticated Stored XSS via devices/name/{agent_id}
CVE-2025-34258 5.1 MEDIUM Advantech WISE-DeviceOn Server < 5.4 Authenticated Stored XSS via devicemap/plan
CVE-2025-34257 5.1 MEDIUM Advantech WISE-DeviceOn Server < 5.4 Authenticated Stored XSS via action/defined
CVE-2025-34263 5.1 MEDIUM Advantech WISE-DeviceOn Server < 5.4 Authenticated Stored XSS via plugin-config/dashboards
CVE-2025-34265 5.1 MEDIUM Advantech WISE-DeviceOn Server < 5.4 Authenticated Stored XSS via rule-engines
CVE-2025-34259 5.1 MEDIUM Advantech WISE-DeviceOn Server < 5.4 Authenticated Stored XSS via devicemap/building

IV. Related Vulnerabilities

Same product: WISE-DeviceOn Server
Same vendor: Advantech Co., Ltd.
Same weakness: CWE-321

V. Comments for CVE-2025-34256

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