CVE-2026-34449

critical · 9.6

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

0.5%

EPSS (exploit prob.)

42nd

EPSS percentile

2026-03-31

Published

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

Weaknesses

CWE-942

Affected products

Vendor	Product	Affected versions
b3log	siyuan	< 3.6.2

Check a specific version with /api/v1/cve/match.

References

https://github.com/siyuan-note/siyuan/issues/17246
https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-68p4-j234-43mv
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-68p4-j234-43mv

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-34449