CVE-2026-74801

High

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.

SeverityHigh

CVSS8.2

Exploit probability—

ProductSiyuan

PublishedAug 17, 2026

First seenAug 17, 2026

Weakness typeCWE-78OS command injection

How to fix

Update

siyuan-note siyuan3.7.4 or later

Vendor advisories

github.com/siyuan-note/siyuan/security/advisories/GHSA-vmp7-pm7g-ghcc

Affected products

Product	Affected versions	Fixed in
siyuan-note siyuan	v < 3.7.4	3.7.4

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