CVE-2026-74801

Administrator command execution via workspace path injection

Published Aug 17, 2026 · Updated Aug 17, 2026

OS command injection in SiYuan before 3.7.4 allows local users to execute arbitrary commands as Administrator via a crafted workspace path. In AddMicrosoftDefenderExclusion(), SiYuan concatenates installPath and util.WorkspaceDir into one ShellExecute argument string with strings.Join, and the bundled elevator.exe helper prepends cmd /c and runs that line without restricting operations or neutralizing metacharacters. Reachability is local and Windows-specific: an attacker must control or induce use of a malicious workspace directory and obtain the expected UAC approval from the Defender exclusion flow, after which the injected command inherits Administrator privileges.

CVSS severity8.6
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in SiYuan before 3.7.4 allows local users to execute arbitrary commands as Administrator via a crafted workspace path. In AddMicrosoftDefenderExclusion(), SiYuan concatenates installPath and util.WorkspaceDir into one ShellExecute argument string with strings.Join, and the bundled elevator.exe helper prepends cmd /c and runs that line without restricting operations or neutralizing metacharacters. Reachability is local and Windows-specific: an attacker must control or induce use of a malicious workspace directory and obtain the expected UAC approval from the Defender exclusion flow, after which the injected command inherits Administrator privileges.

The record

CVE
CVE-2026-74801
Published
Aug 17, 2026
Updated
Aug 17, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-269, CWE-78, CWE-88, T1548, T1059.003
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.7.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

SiYuan Note · SiYuanversion=0 <3.7.4

Published CVSS scores

8.6VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
8.2VulnCheckCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-269Improper Privilege Management
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-88Argument Injection or Modification
T1548Abuse Elevation Control Mechanism
T1059.003Command and Scripting Interpreter: Windows Command Shell

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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