GHSA-JRGP-6VQ3-J6HP
Vulnerability from github – Published: 2026-08-30 15:30 – Updated: 2026-08-30 15:30SiYuan 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": [],
"aliases": [
"CVE-2026-82649"
],
"database_specific": {
"cwe_ids": [
"CWE-427"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-30T15:16:45Z",
"severity": "HIGH"
},
"details": "SiYuan Windows installer before version 3.8.1 (affected versions \u003e= 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\u0027s 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\u0027s 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.",
"id": "GHSA-jrgp-6vq3-j6hp",
"modified": "2026-08-30T15:30:28Z",
"published": "2026-08-30T15:30:28Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-9j65-967f-5rv3"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-82649"
},
{
"type": "WEB",
"url": "https://github.com/siyuan-note/siyuan/commit/251596fc0de2f9528c00c224252fd073a99973f4"
},
{
"type": "WEB",
"url": "https://www.vulncheck.com/advisories/siyuan-before-3.8.1-local-privilege-escalation-via-uncontrolled-search-path"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"type": "CVSS_V4"
}
]
}
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