CVE-2026-100641 SiYuan - Stored XSS

SiYuan before v3.8.4 contains a stored XSS caused by lack of HTML-escaping in flashcard block content in card-manager list markup, letting authenticated administrators execute arbitrary code, exploit requires admin role and attacker-supplied content.

CVSS base score 8.0 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.53% 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: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

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