CVE-2026-56397

Critical

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.

SeverityCritical

CVSS9.6

Exploit probability—

ProductSiYuan

PublishedJun 21, 2026

First seenJun 21, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

SiYuan SiYuan3.6.1 or later

Vendor advisories

github.com/siyuan-note/siyuan/security/advisories/GHSA-v3mg-9v85-fcm7

Affected products

Product	Affected versions	Fixed in
SiYuan SiYuan	v < 3.6.1	3.6.1

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