CVE-2026-93922Public exploitNetwork attack vectorHinoki check available

Command execution via unescaped Daily Note picker

Published Sep 18, 2026 · Updated Sep 18, 2026

Stored XSS in the Daily Note picker in SiYuan 3.8.4 and earlier allows remote attackers to execute operating system commands. The picker concatenates an unescaped notebook name into option markup assigned to Dialog.innerHTML, so an injected event handler runs with Electron Node.js access. Exploitation requires at least two open notebooks and a user to open Daily Note after a crafted notebook arrives through import, sync, or the API.

CVSS severity8.6
High
EPSS probability0.82%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in the Daily Note picker in SiYuan 3.8.4 and earlier allows remote attackers to execute operating system commands. The picker concatenates an unescaped notebook name into option markup assigned to Dialog.innerHTML, so an injected event handler runs with Electron Node.js access. Exploitation requires at least two open notebooks and a user to open Daily Note after a crafted notebook arrives through import, sync, or the API.

The record

CVE
CVE-2026-93922
Published
Sep 18, 2026
Updated
Sep 18, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-79, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <=3.8.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SiYuan Note · SiYuanversion=0 <=3.8.4

Published CVSS scores

8.6VulnCheck CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8VulnCheck CNACVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
9.6GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.002User Execution: Malicious File

Public exploit references

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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