What is CVE-2026-34449?

CVE-2026-34449 is a critical-severity vulnerability in Siyuan-note Siyuan, classified under Permissive Cross-domain Policy with Untrusted Domains. CVSS score: 9.7/10. Published 2026-03-31.

How severe is CVE-2026-34449?

Critical severity. CVSS v3 base score is 9.7 out of 10.

Vulnerability in Siyuan-note Siyuan

CVE-2026-34449

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: * +…

EPSS: 0.002 (42.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.7 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

Affected products

Siyuan-note Siyuan — versions < 3.6.2

Weakness classification (CWE)

CWE-942 — Permissive Cross-domain Policy with Untrusted Domains

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)

Frequently asked questions

What is CVE-2026-34449?: CVE-2026-34449 is a critical-severity vulnerability in Siyuan-note Siyuan, classified under Permissive Cross-domain Policy with Untrusted Domains. CVSS score: 9.7/10. Published 2026-03-31.
How severe is CVE-2026-34449?: Critical severity. CVSS v3 base score is 9.7 out of 10.