{"id":"CVE-2026-59105","published":"2026-11-06T15:17:22.270","lastModified":"2026-11-06T16:18:57.353","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.","cvssScore":9.8,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwes":["CWE-547","CWE-1391"],"vendors":[],"products":[],"references":[{"url":"https://offseq.com/en/research/jumis-cve-2026-59105/","tags":[]},{"url":"https://www.mansjumis.lv/","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"Jumis hard-codes a deterministic password for the sysadmin-privileged SQL login ##Tilde_JumisAdmin## using only the non-secret SQL Server name and a fixed secret key, allowing any network-accessible attacker to compute the password and gain full database and OS control via xp_cmdshell.","exploitability":"Trivial to exploit over the network with no authentication or user interaction required, as the server name is discoverable via standard SQL Server discovery mechanisms (UDP 1434, TDS pre-login, DNS/NetBIOS).","blast_radius":"Any attacker who can reach the SQL Server instance gains sysadmin privileges and full read/write access to all customer accounting databases, plus OS-level command execution on the database server.","remediation":"Upgrade to Jumis version 2.590 or later, which removes the hard-coded password derivation and enforces unique, non-deterministic credentials per instance.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["sql-injection","auth-bypass","privilege-escalation","rce","hardcoded-credentials"],"model":"garnet-coder","analyzedAt":"2026-11-07T09:53:11.731Z"}}