CVE-2026-45375Public exploitNetwork attack vector

Command execution via unescaped marketplace package metadata

Published May 14, 2026 · Updated May 14, 2026

Stored XSS in SiYuan 3.6.5 and earlier allows remote authenticated users to execute OS commands through Bazaar package metadata. The sanitizePackageDisplayStrings helpers leave Name and Version unescaped, while bazaar.ts inserts those fields into templates assigned to innerHTML. Execution requires a user to open the affected marketplace view; Electron clients expose Node APIs, while browser deployments remain limited to script execution in the UI.

CVSS severity9.0
Critical
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in SiYuan 3.6.5 and earlier allows remote authenticated users to execute OS commands through Bazaar package metadata. The sanitizePackageDisplayStrings helpers leave Name and Version unescaped, while bazaar.ts inserts those fields into templates assigned to innerHTML. Execution requires a user to open the affected marketplace view; Electron clients expose Node APIs, while browser deployments remain limited to script execution in the UI.

The record

CVE
CVE-2026-45375
Published
May 14, 2026
Updated
May 14, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-79, CWE-116, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 14, 2026CVE publishedPublication date reported by the CVE source.
  2. May 14, 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=<= 3.6.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SiYuan Note · SiYuanversion=<= 3.6.5

Published CVSS scores

9.0GitHubCVSS:3.1/AV:N/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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-116Improper Encoding or Escaping of Output
T1203Exploitation for Client Execution

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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