Vulnerability · Published Jun 21, 2026 · Assigned by VulnCheck

CVE-2026-56397SiYuan - Remote Code Execution via Malicious Bazaar Package Metadata and README

Critical 9.6

In plain English

A critical-severity cross-site scripting in SiYuan from SiYuan. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.6Critical

Exploit odds (30 days)0.5%top 57.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

SiYuan before v3.6.1 fails to sanitize package metadata and README content in the Bazaar marketplace, allowing malicious package authors to inject arbitrary HTML and JavaScript. Attackers can achieve remote code execution on any user browsing the Bazaar by embedding XSS payloads in package displayName, description, or README fields, exploiting Electron's nodeIntegration setting to execute OS commands.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/siyuan-note/siyuan/kernel	no fix listed	GHSA-v3mg-9v85-fcm7
Go	github.com/siyuan-note/siyuan/kernel	0.0.0-20260317012524-fe4523fff2c8	GO-2026-4720

Affected products (as reported)

Vendor	Product	Versions
SiYuan	SiYuan	0 – before 3.6.1

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

References

GHSA Advisory GHSA-v3mg-9v85-fcm7 vendor-advisory
VulnCheck Advisory: SiYuan - Remote Code Execution via Malicious Bazaar Package Metadata and README third-party-advisory