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Vulnerability record · CVE-2026-34449 · published 31 March 2026

CVE-2026-34449: B3log siyuan vulnerability

B3log · Siyuan

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.

9.6 CVSS 3.1 Critical EPSS 0.80% · top 45.1% CWE-942 · CWE-942
9.6CVSS 3.1 base score
0.80%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
24 Jul 2026Last modified by 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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/siyuan-note/siyuan/issues/17246 Issue Tracking
https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2 Release Notes
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-68p4-j234-43mv ExploitVendor Advisory
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-68p4-j234-43mv ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-32767B3log siyuan sql injection vulnerabilitySiYuan is a personal knowledge management system. Versions 3.6.0 and below contain an authorization bypass vulnerability in the /api/search/fullTextS…EPSS 0.70%9.8CVE-2026-30869B3log siyuan path traversal vulnerabilitySiYuan is a personal knowledge management system. Prior to 3.5.10, a path traversal vulnerability in the /export endpoint allows an attacker to read …EPSS 1.1%9.8CVE-2024-53507B3log siyuan sql injection vulnerabilityA SQL injection vulnerability was discovered in Siyuan 3.1.11 in /getHistoryItems.EPSS 0.57%9.8CVE-2024-53504B3log siyuan sql injection vulnerabilityA SQL injection vulnerability has been identified in Siyuan 3.1.11 via the notebook parameter in /searchHistory.EPSS 0.57%9.8CVE-2024-53505B3log siyuan sql injection vulnerabilityA SQL injection vulnerability has been identified in Siyuan 3.1.11 via the id parameter at /getAssetContent.EPSS 0.51%9.8CVE-2024-53506B3log siyuan sql injection vulnerabilityA SQL injection vulnerability has been identified in Siyuan 3.1.11 via the ids array parameter in /batchGetBlockAttrs.EPSS 0.54%9.1CVE-2026-32749B3log siyuan path traversal vulnerabilitySiYuan is a personal knowledge management system. In versions 3.6.0 and below, POST /api/import/importSY and POST /api/import/importZipMd write uploa…EPSS 0.57%9.0CVE-2026-40322B3log siyuan cross-site scripting vulnerabilitySiYuan is an open-source personal knowledge management system. In versions 3.6.3 and below, Mermaid diagrams are rendered with securityLevel set to "…EPSS 0.53%

Source: NIST National Vulnerability Database (record CVE-2026-34449), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.