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CVE-2026-82649— SiYuan before 3.8.1 Local Privilege Escalation via Uncontrolled Search Path

Quick assessment

Affected
siyuan-note siyuan
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SiYuan Windows 安装程序在 3.8.1 版本之前（受影响的版本为 2.0.14 及更高版本）存在“非受控搜索路径元素”漏洞，位于其 NSIS 安装程序中。该安装程序通过名称（而非绝对路径）调用诸如 TASKKILL 等系统可执行文件。由于 NSIS 的 在解析这些调用时，使用的搜索路径将安装程序自身的启动目录置于 System32 目录之前，因此，如果攻击者在该目录中植入一个恶意可执行文件（例如，一个重命名为 TASKKILL.exe 的二进制文件），当安装程序运行时，该文件可能会被执行。这些调用发生

CVSS 7.0 · High
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I. Basic Information for CVE-2026-82649

Vulnerability Information
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Vulnerability Title
SiYuan before 3.8.1 Local Privilege Escalation via Uncontrolled Search Path
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对搜索路径元素未加控制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
siyuan-note siyuan 2.0.14 ~ 3.8.1 -

II. Public POCs for CVE-2026-82649

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III. Intelligence Information for CVE-2026-82649

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Patches & Fixes for CVE-2026-82649 (1)

Vendor Advisories for CVE-2026-82649 (2)

Same Patch Batch · siyuan-note · 2026-08-30 · 6 CVEs total

CVE-2026-82654 8.9 HIGH SiYuan before v3.8.1 Stored XSS via block name
CVE-2026-82653 8.9 HIGH SiYuan before v3.8.1 Stored XSS via confirmDialog
CVE-2026-82652 5.3 MEDIUM SiYuan before v3.8.1 Information Disclosure via Publish Access
CVE-2026-82651 4.9 MEDIUM SiYuan before v3.8.1 Missing Authorization via /history and /repo/diff
CVE-2026-82650 4.4 MEDIUM SiYuan before v3.8.1 Path Traversal via /api/template/render

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-427

V. Comments for CVE-2026-82649

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