CVE-2026-93922 SiYuan - Stored XSS & Remote Code Execution

SiYuan <= 3.8.4 contains a stored cross-site scripting caused by rendering notebook names as raw HTML in the Daily Note picker dialog, letting attackers execute JavaScript with Node.js access and OS commands, exploit requires attacker to create notebooks with malicious names.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.82% chance of exploitation in 30 days
View the NVD record ↗

Details

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

Vendor fix

Update to the latest version beyond 3.8.4.

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

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