CVE-2026-100638 SiYuan - Path Traversal

SiYuan < v3.8.4 contains a path traversal caused by directory traversal sequences in the notebook parameter in setNotebookIcon endpoint, letting authenticated administrators write files outside workspace boundary.

CVSS base score 7.6 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.47% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Path Traversal
Impact
File System Write
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:L
Published
26 September 2026
Updated
15 October 2026
Weakness
CWE-73

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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