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CVE-2026-74801— SiYuan before 3.7.4 Local Privilege Escalation via elevator.exe

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是SiYuan团队开源的一款文档管理软件。 SiYuan 3.7.4之前版本存在命令注入漏洞，该漏洞源于未能正确转义工作区目录路径，可能导致攻击者创建包含命令元字符的恶意工作区目录，触发Microsoft Defender排除流程，在UAC批准后以管理员权限执行任意命令。

CVSS 8.2 · High EPSS 0.21% · P10

Possible ATT&CK Techniques 2 AI

T1055 · Process Injection T1500.001

Affected Version Matrix 2

VendorProduct Version RangeStatus
siyuan-note siyuan < 3.7.4 affected
3.7.4 unaffected
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I. Basic Information for CVE-2026-74801

Vulnerability Information
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Vulnerability Title
SiYuan before 3.7.4 Local Privilege Escalation via elevator.exe
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan before 3.7.4 fails to properly escape workspace directory paths when constructing command-line arguments for the elevated elevator.exe helper process. Attackers can create a malicious workspace directory with command metacharacters in its path and trigger the Microsoft Defender exclusion flow to execute arbitrary commands with administrator privileges after UAC approval.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SiYuan是SiYuan团队开源的一款文档管理软件。 SiYuan 3.7.4之前版本存在命令注入漏洞，该漏洞源于未能正确转义工作区目录路径，可能导致攻击者创建包含命令元字符的恶意工作区目录，触发Microsoft Defender排除流程，在UAC批准后以管理员权限执行任意命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
siyuan-note siyuan 0 ~ 3.7.4 -

II. Public POCs for CVE-2026-74801

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III. Intelligence Information for CVE-2026-74801

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Vendor Advisories for CVE-2026-74801 (2)

Same Patch Batch · siyuan-note · 2026-08-17 · 7 CVEs total

CVE-2026-74799 9.3 CRITICAL SiYuan before 3.7.4 Unauthenticated Debug Endpoint Information Disclosure
CVE-2026-74800 9.0 CRITICAL SiYuan before v3.7.4 Stored XSS via assets endpoint
CVE-2026-74798 8.7 HIGH SiYuan kernel Path Traversal via database_clean MCP tool
CVE-2026-74802 8.2 HIGH SiYuan 3.7.3 Cross-Site WebSocket Hijacking via network proxy
CVE-2026-74868 7.5 HIGH SiYuan before 3.7.4 Brute-Force Authentication via Publish Service
CVE-2026-74867 4.2 MEDIUM SiYuan before 3.7.4 Cross-Site Request Forgery via CheckAuth

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-78

V. Comments for CVE-2026-74801

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