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CVE-2026-54069— SiYuan: Unauthenticated Admin API Access via Blanket chrome-extension:// Origin Allowlist

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之前版本存在输入验证错误漏洞，该漏洞源于内核HTTP服务器无条件信任所有chrome-extension://来源，导致任何浏览器扩展无需身份验证即可获得RoleAdministrator权限，结合桌面安装默认的空白AccessAuthCode，任何Chrome/Chromium扩展（包括通过供应链攻击受损的合法扩展）可以对127.0.0.1:6806上的SiYuan内核进行完全认证的管理API调用，从而实现数据渗漏、存储

AI Predicted 9.1 Difficulty: Easy EPSS 0.58% · P46

Public Exploits 1

Nuclei · 1 CVE-2026-54069.yaml [template]

Affected Version Matrix 1

VendorProduct Version RangeStatus
siyuan-note siyuan < 3.7.0 affected
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I. Basic Information for CVE-2026-54069

Vulnerability Information
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Vulnerability Title
SiYuan: Unauthenticated Admin API Access via Blanket chrome-extension:// Origin Allowlist
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, SiYuan Note's kernel HTTP server unconditionally trusts all chrome-extension:// origins, granting RoleAdministrator access to every installed browser extension without any authentication. Combined with the default empty AccessAuthCode on desktop installs, any Chrome/Chromium extension -- including a compromised legitimate extension via supply chain attack -- can make fully authenticated admin API calls to the SiYuan kernel at 127.0.0.1:6806, enabling data exfiltration, stored XSS injection, and configuration tampering. This vulnerability is fixed in 3.7.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 输入验证错误漏洞
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之前版本存在输入验证错误漏洞，该漏洞源于内核HTTP服务器无条件信任所有chrome-extension://来源，导致任何浏览器扩展无需身份验证即可获得RoleAdministrator权限，结合桌面安装默认的空白AccessAuthCode，任何Chrome/Chromium扩展（包括通过供应链攻击受损的合法扩展）可以对127.0.0.1:6806上的SiYuan内核进行完全认证的管理API调用，从而实现数据渗漏、存储
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
siyuan-note siyuan < 3.7.0 -

II. Public POCs for CVE-2026-54069

# POC Description Source Link Shenlong Link
1 SiYuan Note 3.6.5 and prior is vulnerable to authentication bypass. The CheckAuth middleware unconditionally trusted all chrome-extension:// origins, granting RoleAdministrator access without token validation to any request with a spoofed Origin header. Fixed in v3.7.0. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-54069.yaml POC Details
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default-local-qwen3.6 · 10379 chars
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III. Intelligence Information for CVE-2026-54069

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Vendor Advisories for CVE-2026-54069 (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-2026-54067 9.9 CRITICAL SiYuan: Stored XSS to RCE via CSS-snippet <style> breakout in renderSnippet()
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

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-346

V. Comments for CVE-2026-54069

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