What is CVE-2026-39846?

CVE-2026-39846 is a critical-severity vulnerability in Siyuan-note Siyuan, classified under Cross-site Scripting. CVSS score: 9.1/10. Published 2026-04-07.

How severe is CVE-2026-39846?

Critical severity. CVSS v3 base score is 9.1 out of 10.

RCE in Siyuan-note Siyuan

CVE-2026-39846

SiYuan is a personal knowledge management system. Prior to 3.6.4, a malicious note synced to another user can trigger remote code execution in the SiYuan Electron desktop client. The root cause is that table caption content is stored witho…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.001 (19.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H.

Affected products

Siyuan-note Siyuan — versions < 3.6.4

Weakness classification (CWE)

References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-phhp-9rm9-6gr2 (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-39846?: CVE-2026-39846 is a critical-severity vulnerability in Siyuan-note Siyuan, classified under Cross-site Scripting. CVSS score: 9.1/10. Published 2026-04-07.
How severe is CVE-2026-39846?: Critical severity. CVSS v3 base score is 9.1 out of 10.