Vulnerability · Published Mar 31, 2026 · Assigned by GitHub_M

CVE-2026-34449SiYuan: Cross-Origin RCE via Permissive CORS Policy and JavaScript Snippet Injection

Critical 9.7

In plain English

A critical-severity security flaw in siyuan from siyuan-note. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.7Critical

Exploit odds (30 days)0.5%top 56.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/siyuan-note/siyuan/kernel	3.6.2	GHSA-68p4-j234-43mv
Go	github.com/siyuan-note/siyuan/kernel	no fix listed	GO-2026-5171

Affected products (as reported)

Vendor	Product	Versions
siyuan-note	siyuan	< 3.6.2

Weakness: CWE-942 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

References

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