CVE-2026-59105
Universal sysadmin credential vulnerability in Jumis
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.
INFO
Published Date :
Nov. 6, 2026, 2:09 p.m.
Last Modified :
Nov. 6, 2026, 2:09 p.m.
Remotely Exploit :
Yes !
Source :
ENISA
Affected Products
The following products are affected by CVE-2026-59105
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | a6d3dc9e-0591-4a13-bce7-0f5b31ff6158 | ||||
| CVSS 4.0 | CRITICAL | a6d3dc9e-0591-4a13-bce7-0f5b31ff6158 |
Solution
- Implement strong, unique passwords for administrative accounts.
- Remove the '##Tilde_JumisAdmin##' login.
- Restrict membership in the 'sysadmin' role.
- Disable 'xp_cmdshell' unless absolutely necessary.
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CVE-2026-59105 vulnerability anywhere in the article.