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

Quick assessment

Affected
SiYuan SiYuan
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SiYuan是SiYuan团队开源的一个个人知识管理系统。 SiYuan 3.6.1之前版本存在跨站脚本漏洞，该漏洞源于未对Bazaar市场中的包metadata和README内容进行清理，可能导致恶意包作者注入任意HTML和JavaScript。攻击者可通过在包displayName、description或README字段中嵌入XSS有效载荷，利用Electron的nodeIntegration设置执行OS命令，实现远程代码执行。

CVSS 9.6 · Critical EPSS 0.50% · P41

Affected Version Matrix 2

VendorProduct Version RangeStatus
SiYuan SiYuan < 3.6.1 affected
3.6.1 unaffected
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I. Basic Information for CVE-2026-56397

Vulnerability Information
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Vulnerability Title
SiYuan - Remote Code Execution via Malicious Bazaar Package Metadata and README
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SiYuan是SiYuan团队开源的一个个人知识管理系统。 SiYuan 3.6.1之前版本存在跨站脚本漏洞，该漏洞源于未对Bazaar市场中的包metadata和README内容进行清理，可能导致恶意包作者注入任意HTML和JavaScript。攻击者可通过在包displayName、description或README字段中嵌入XSS有效载荷，利用Electron的nodeIntegration设置执行OS命令，实现远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
SiYuan SiYuan 0 ~ 3.6.1 -

II. Public POCs for CVE-2026-56397

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 5225 chars
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III. Intelligence Information for CVE-2026-56397

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Vendor Advisories for CVE-2026-56397 (2)

IV. Related Vulnerabilities

Same product: SiYuan
Same vendor: SiYuan
Same weakness: CWE-79

V. Comments for CVE-2026-56397

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