What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-17 · updated 2026-08-26
• Weakness: CWE-78

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

• siyuan-note siyuan: before 3.7.4 — fixed in 3.7.4

How to fix

Upgrade to a fixed version: siyuan-note siyuan 3.7.4. Check the vendor advisory for mitigations.

References

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

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