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CVE-2026-59105— Universal sysadmin credential vulnerability in Jumis

Quick assessment

Affected
Jumis Pro SIA Jumis
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.

Jumis（原名为 Tildes Jumis）会创建并使用一个名为 的 Microsoft SQL Server 登录账户，其密码由单一非机密输入——即 SQL Server 服务器名称（ ）——通过确定性算法派生得出。该派生算法硬编码于客户端应用程序中，在所有安装环境中完全一致，并包含一个用于提供熵的硬编码密钥。由于唯一的输入（服务器名称）并非机密——实例后缀为硬编码，而主机名可通过 SQL Server Browser 服务（UDP 1434）、TDS 预登录响应或 DNS/NetBIOS 等手段获取——任何能

CVSS 9.8 · Critical EPSS 1.44% · P73

Affected Version Matrix 1

VendorProduct Version RangeStatus
Jumis Pro SIA Jumis < TJ7.0.141.36 affected
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I. Basic Information for CVE-2026-59105

Vulnerability Information
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Vulnerability Title
Universal sysadmin credential vulnerability in Jumis
Source: CVE Program / CVE List V5
Vulnerability Description
Jumis (formerly Tildes Jumis) creates and uses a Microsoft SQL Server login named ##Tilde_JumisAdmin## whose password is derived deterministically from a single non-secret input - the SQL Server name (@@servername). The derivation algorithm is hard-coded in the client application and is identical across every installation; it contains a hard-coded secret key for entropy. Because the only input (the server name) is not secret - the instance suffix is hard-coded and the host name is discoverable via the SQL Server Browser service (UDP 1434), the TDS pre-login response, or DNS/NetBIOS - any party able to reach a Jumis SQL Server can compute the password offline and authenticate. The ##Tilde_JumisAdmin## login is a member of the sysadmin server role. Successful authentication therefore grants full administrative control of the SQL Server instance and read/write access to every customer's accounting database hosted on it. The on-premise server installation also programmatically enables xp_cmdshell during routine operation, so sysadmin access escalates to operating-system command execution on the database server.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1391
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Jumis Pro SIA Jumis 0 ~ TJ7.0.141.36 -

II. Public POCs for CVE-2026-59105

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III. Intelligence Information for CVE-2026-59105

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Other References for CVE-2026-59105 (2)

IV. Related Vulnerabilities

Same weakness: CWE-1391