CVE-2026-87811 SiYuan - Stored XSS

SiYuan < 3.8.2 contains a stored XSS caused by improper attribute encoding of persisted notebook template paths in HTML input value attributes, letting attackers execute JavaScript when victims open notebook configuration, exploit requires crafted malicious template paths.

CVSS base score 7.3 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.37% chance of exploitation in 30 days
View the NVD record ↗

Details

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

Vendor fix

Update to version 3.8.2 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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