CVE-2026-34449

9.6 CRITICAL
Published: March 31, 2026 Modified: April 03, 2026
View on NVD

Description

SiYuan is a personal knowledge management system. Prior to version 3.6.2, a malicious website can achieve Remote Code Execution (RCE) on any desktop running SiYuan by exploiting the permissive CORS policy (Access-Control-Allow-Origin: * + Access-Control-Allow-Private-Network: true) to inject a JavaScript snippet via the API. The injected snippet executes in Electron's Node.js context with full OS access the next time the user opens SiYuan's UI. No user interaction is required beyond visiting the malicious website while SiYuan is running. This issue has been patched in version 3.6.2.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/siyuan-note/siyuan/issues/17246
Source: security-advisories@github.com
Issue Tracking
https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2
Source: security-advisories@github.com
Release Notes
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-68p4-j234-43mv
Source: security-advisories@github.com
Exploit Vendor Advisory
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-68p4-j234-43mv
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Exploit Vendor Advisory

4 reference(s) from NVD

Quick Stats

CVSS v3 Score
9.6 / 10.0
EPSS (Exploit Probability)
0.1%
34th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

b3log