CVE-2026-100643 SiYuan - Stored XSS & Remote Code Execution

SiYuan < v3.8.4 contains a stored XSS caused by improper escaping of Attribute View values in textarea elements, letting authenticated attackers execute JavaScript and potentially commands in Electron app, exploit requires authentication.

CVSS base score 8.0 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.42% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Stored XSS
Impact
Remote Code Execution, Stored XSS
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Published
26 September 2026
Updated
15 October 2026
Weakness
CWE-79

Vendor fix

Update to version v3.8.4 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

← All CVEs