--- id: CVE-2026-82649 title: >- 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 absolu… summary: >- 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 absolu… severity: none cwe: - CWE-427 published: '2026-08-30' updated: '2026-08-30' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-82649' references: - url: >- https://github.com/siyuan-note/siyuan/commit/251596fc0de2f9528c00c224252fd073a99973f4 label: disclosure@vulncheck.com - url: >- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-9j65-967f-5rv3 label: disclosure@vulncheck.com - url: >- https://www.vulncheck.com/advisories/siyuan-before-3.8.1-local-privilege-escalation-via-uncontrolled-search-path label: disclosure@vulncheck.com tags: - nvd ingestedAt: '2026-08-30T23:59:28.616Z' epss: 0.00173 epssPercentile: 0.05924 --- ## Overview 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. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges.