Vulnerability · Published Aug 17, 2026 · Assigned by VulnCheck

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

High 8.2

In plain English

A high-severity OS command injection in siyuan from siyuan-note. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities).

Severity (CVSS 3.1)8.2High

Exploit odds (30 days)0.2%top 89.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
siyuan-note	siyuan	0 – before 3.7.4

Weakness: CWE-78 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

References

GitHub Security Advisory (GHSA-vmp7-pm7g-ghcc) vendor-advisory
VulnCheck Advisory: SiYuan before 3.7.4 Local Privilege Escalation via elevator.exe third-party-advisory