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CVE-2026-54067— SiYuan: Stored XSS to RCE via CSS-snippet <style> breakout in renderSnippet()

Quick assessment

Affected
siyuan-note 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 3.7.0之前版本存在安全漏洞，该漏洞源于CSS片段主体中包含的</style>标签在renderSnippet()函数通过insertAdjacentHTML插值时跳出其周围的<style>标签，允许执行任意JavaScript。该漏洞可能导致跨站脚本攻击，进而通过Electron桌面构建的渲染器运行nodeIntegration:true特性链接触发远程代码执行。

CVSS 9.9 · Critical EPSS 0.54% · P44

Affected Version Matrix 1

VendorProduct Version RangeStatus
siyuan-note siyuan < 3.7.0 affected
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I. Basic Information for CVE-2026-54067

Vulnerability Information
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Vulnerability Title
SiYuan: Stored XSS to RCE via CSS-snippet <style> breakout in renderSnippet()
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, CSS snippet body containing </style> breaks out of its surrounding <style> tag when renderSnippet() interpolates it via insertAdjacentHTML. A payload like runs arbitrary JavaScript in the renderer. On Electron desktop builds the renderer runs with nodeIntegration:true, so require('child_process') is reachable from the injected handler and the XSS chains to host RCE. Snippets sync via the workspace repository, so an attacker with write access to any synced workspace plants the payload once and it fires on every device that pulls. The bug also bypasses the user's enabledCSS / enabledJS separation. A user who turned enabledJS off was making a deliberate call not to run untrusted JavaScript; the CSS path runs it anyway. This vulnerability is fixed in 3.7.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/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 配置错误漏洞
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 3.7.0之前版本存在安全漏洞，该漏洞源于CSS片段主体中包含的</style>标签在renderSnippet()函数通过insertAdjacentHTML插值时跳出其周围的<style>标签，允许执行任意JavaScript。该漏洞可能导致跨站脚本攻击，进而通过Electron桌面构建的渲染器运行nodeIntegration:true特性链接触发远程代码执行。
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-note siyuan < 3.7.0 -

II. Public POCs for CVE-2026-54067

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Qwen3.6-35B-A3B · 6555 chars
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III. Intelligence Information for CVE-2026-54067

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Other References for CVE-2026-54067 (1)

Same Patch Batch · siyuan-note · 2026-06-24 · 9 CVEs total

CVE-2026-54158 9.9 CRITICAL SiYuan: Stored XSS to RCE via attribute-view cell rendering in genAVValueHTML()
CVE-2026-50551 9.9 CRITICAL SiYuan: Stored XSS to RCE via Unsanitized Attribute View Asset Cell Content
CVE-2026-55570 9.0 CRITICAL SiYuan: Stored XSS results to Electron RCE in SiYuan marketplace via unescaped `data-obj`
CVE-2026-54066 7.5 HIGH SiYuan: Path Traversal via Double URL Encoding in /assets/*path (publish mode arbitrary fi
CVE-2026-54070 7.1 HIGH SiYuan: Stored XSS in Bazaar marketplace via package README event handlers
CVE-2026-54068 5.9 MEDIUM SiYuan: Unauthenticated SQLite Data Exfiltration via Template Injection in /api/icon/getDy
CVE-2026-54759 SiYuan: Lute HTML sanitizer allows `<iframe>` tags in Bazaar package README, leading to ar
CVE-2026-54069 SiYuan: Unauthenticated Admin API Access via Blanket chrome-extension:// Origin Allowlist

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-79

V. Comments for CVE-2026-54067

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