Vulnerability Description
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.
Related Weaknesses (CWE)
References
- https://github.com/siyuan-note/siyuan/commit/251596fc0de2f9528c00c224252fd073a99
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-9j65-967f-5rv3
- https://www.vulncheck.com/advisories/siyuan-before-3.8.1-local-privilege-escalat
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-9j65-967f-5rv3
FAQ
What is CVE-2026-82649?
CVE-2026-82649 is a documented vulnerability. 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 T...
How severe is CVE-2026-82649?
CVSS scoring is not yet available for CVE-2026-82649. Check NVD for updates.
Is there a patch for CVE-2026-82649?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.