CVE-2026-34449 (GCVE-0-2026-34449)

Vulnerability from cvelistv5 – Published: 2026-03-31 21:45 – Updated: 2026-04-01 15:52
VLAI
Title
SiYuan: Cross-Origin RCE via Permissive CORS Policy and JavaScript Snippet Injection
Summary
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.
Severity
9.7 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-01 15:28 UTC
CWE
  • CWE-942 - Permissive Cross-domain Policy with Untrusted Domains
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
siyuan-note siyuan Affected: < 3.6.2
Create a notification for this product.
Show details on NVD website
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                "id": "CVE-2026-34449",
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            "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-68p4-j234-43mv"
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    "state": "PUBLISHED"
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