CVE

CVE-2026-54069

9.2

CVSScritical

Exploitable remotely over the internet · no authentication required.

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.

Attack Vector

Network

Privileges Req.

None

User Interaction

None

siyuan

Updated Nov 10, 2026View on NVD →

S4E scanner

criticalProduct Based Web Vulnerabilities~10 seconds

SiYuan Note <= 3.6.5 - Authentication Bypass

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. References: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hvr9-72v2-fff3 https://nvd.nist.gov/vuln/detail/CVE-2026-54069 Remediation: Update to SiYuan Note v3.7.0 or later.

Used 20 times · 10 assets checked · domain, subdomain, ipv4

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CVE history: siyuan

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