CVE-2026-82649
HIGH
7,0
Source: [email protected]
Attack Vector: local
Attack Complexity: low
Privileges Required: low
User Interaction: passive
Confidentiality: N/A
Integrity: N/A
Availability: N/A
Description
AI Translation Available
SiYuan Windows installer before version 3.8.1 (affected versions >= 2.0.14) contains an uncontrolled search path element vulnerability in its NSIS installer, which invokes system executables such as TASKKILL by name rather than by absolute path. Because NSIS nsExec::Exec resolves these calls using a search path that includes the installer's own launch directory ahead of System32, an attacker who plants a malicious executable (e.g., a renamed TASKKILL.exe) in that directory can have it executed when the installer runs. These calls occur in electron-builder's preInit hook before the license page is displayed, and with an all-users (elevated) install the planted binary executes with an elevated token, resulting in local privilege escalation.
427
Uncontrolled Search Path Element
DraftCommon Consequences
Security Scopes Affected:
Confidentiality
Integrity
Availability
Potential Impacts:
Execute Unauthorized Code Or Commands
Applicable Platforms
All platforms may be affected
https://github.com/siyuan-note/siyuan/commit/251596fc0de2f9528c00c224252fd073a9…
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-9j65-967f-5rv3
https://www.vulncheck.com/advisories/siyuan-before-3.8.1-local-privilege-escala…