CVE-2026-33067Public exploitNetwork attack vector

OS command execution via unescaped Bazaar metadata

Published Mar 20, 2026 · Updated Mar 20, 2026

Stored XSS in SiYuan before 3.6.1 allows attackers to execute OS commands when a desktop user opens the Bazaar page. The Bazaar card renderer inserts package displayName and description values into HTML templates without escaping, and Electron exposes Node.js APIs to injected scripts. Exploitation requires malicious metadata to enter the community marketplace; loading its listing runs commands with the victim's operating-system privileges.

CVSS severity5.3
Medium
EPSS probability0.55%
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 before 3.6.1 allows attackers to execute OS commands when a desktop user opens the Bazaar page. The Bazaar card renderer inserts package displayName and description values into HTML templates without escaping, and Electron exposes Node.js APIs to injected scripts. Exploitation requires malicious metadata to enter the community marketplace; loading its listing runs commands with the victim's operating-system privileges.

The record

CVE
CVE-2026-33067
Published
Mar 20, 2026
Updated
Mar 20, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 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=< 3.6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SiYuan Note · SiYuanversion=< 3.6.1

Published CVSS scores

9.6SiYuan upstream advisoryCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
5.3GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

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')
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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