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

CVSS 9.9 · Critical EPSS 0.31% · P22
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
siyuan-notesiyuan < 3.7.0 -

II. Public POCs for CVE-2026-54067

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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-2026-541589.9 CRITICALSiYuan: Stored XSS to RCE via attribute-view cell rendering in genAVValueHTML()
CVE-2026-505519.9 CRITICALSiYuan: Stored XSS to RCE via Unsanitized Attribute View Asset Cell Content
CVE-2026-555709.0 CRITICALSiYuan: Stored XSS results to Electron RCE in SiYuan marketplace via unescaped `data-obj`
CVE-2026-540667.5 HIGHSiYuan: Path Traversal via Double URL Encoding in /assets/*path (publish mode arbitrary fi
CVE-2026-540707.1 HIGHSiYuan: Stored XSS in Bazaar marketplace via package README event handlers
CVE-2026-540685.9 MEDIUMSiYuan: Unauthenticated SQLite Data Exfiltration via Template Injection in /api/icon/getDy
CVE-2026-54759SiYuan: Lute HTML sanitizer allows `<iframe>` tags in Bazaar package README, leading to ar
CVE-2026-54069SiYuan: 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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