High severity · published Aug 17, 2026
CVE-2026-74801
SiYuan before 3.7.4 Local Privilege Escalation via elevator.exe
8.2
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 10% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SI
siyuan · siyuan-note
before 3.7.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-74801
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-74801
github.com
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-vmp7-pm7g-ghcc
www.vulncheck.com
https://www.vulncheck.com/advisories/siyuan-before-local-privilege-escalation-via-elevator-exe
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