by Kastro
Paper/Archive/CVE-2026-34449

CVE-2026-34449

siyuan-note siyuan — SiYuan: Cross-Origin RCE via Permissive CORS Policy and JavaScript Snippet Injection

EPSS 0.5%public exploitCVSS 9.7
critical.is priorityof 100
48
CVSS 9.7 (CNA)9.7 / 10 × 3029.1Not in CISA KEV+300.0EPSS percentile 43.4.434 × 208.7Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
siyuan< 3.6.2–CNA

Scores by source

GitHub_M (CNA)9.7CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

exploitgithub.com/siyuan-note/siyuan/security/advisories/GHSA-68p4-j234-43mvrefgithub.com/siyuan-note/siyuan/issues/17246refgithub.com/siyuan-note/siyuan/releases/tag/v3.6.2