CVE-2026-82649
published 2026-08-30CVE-2026-82649: SiYuan Windows installer before version 3.8.1 (affected versions >= 2.0.14) contains an uncontrolled search path element vulnerability in its NSIS installer…
PriorityP428high7CVSS 4.0
AVLACLATNPRLUIPVCHVIHVAHSCNSINSANEXCRXIRXARXMAVXMACXMATXMPRXMUIXMVCXMVIXMVAXMSCXMSIXMSAXSXAUXRXVXREXUX
EPSS
0.17%
6.0th percentile
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.
Affected
1 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| siyuan-note | siyuan | >= 2.0.14 < 3.8.1 | 3.8.1 |
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VulDB
SiYuan-Note SiYuan up to 3.8.0 preInit hook uncontrolled search path
vuldb·2026-08-30·CVSS 7.0
CVE-2026-82649 [HIGH] SiYuan-Note SiYuan up to 3.8.0 preInit hook uncontrolled search path
A vulnerability classified as critical has been found in SiYuan-Note SiYuan up to 3.8.0. Affected is an unknown function of the component preInit hook. This manipulation causes uncontrolled search path.
This vulnerability is registered as CVE-2026-82649. The attack needs to be launched locally. No exploit is available.
It is recommended to upgrade the affected component.
GHSA
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
ghsa_unreviewed·2026-08-30
CVE-2026-82649 [HIGH] CWE-427 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
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.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://github.com/siyuan-note/siyuan/commit/251596fc0de2f9528c00c224252fd073a99973f4https://github.com/siyuan-note/siyuan/security/advisories/GHSA-9j65-967f-5rv3https://www.vulncheck.com/advisories/siyuan-before-3.8.1-local-privilege-escalation-via-uncontrolled-search-pathhttps://github.com/siyuan-note/siyuan/security/advisories/GHSA-9j65-967f-5rv3
2026-08-30
Published