CVE-2026-74801

HIGH 8.2

SiYuan before 3.7.4 Local Privilege Escalation via elevator.exe

CVSS Score

8.2

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-78
Vendor	siyuan-note
Product	siyuan
Published	Aug 17, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

siyuan-note / siyuan

0 < 3.7.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-vmp7-pm7g-ghcc vulncheck.com: https://www.vulncheck.com/advisories/siyuan-before-local-privilege-escalation-via-elevator-exe

Credits

🔍 alham-rizvi