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Vulnerability record · CVE-2026-100638 · published 26 September 2026

CVE-2026-100638: SiYuan versions before v3.8.4 contain a path traversal vulnerability in the setNotebookIcon endpoint that allo…

SiYuan versions before v3.8.4 contain a path traversal vulnerability in the setNotebookIcon endpoint that allows authenticated administrators to create arbitrary directory trees and write files outside the workspace boundary. Attackers can supply directory traversal sequences in the notebook parameter to escape the workspace data directory and write conf.json files to arbitrary locations accessible by the kernel process.

8.3 CVSS 4.0 High EPSS 0.47% · top 61.5% CWE-73 · CWE-73 Deferred
8.3CVSS 4.0 base score
0.47%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
26 Sep 2026Last modified by NVD

Description

SiYuan versions before v3.8.4 contain a path traversal vulnerability in the setNotebookIcon endpoint that allows authenticated administrators to create arbitrary directory trees and write files outside the workspace boundary. Attackers can supply directory traversal sequences in the notebook parameter to escape the workspace data directory and write conf.json files to arbitrary locations accessible by the kernel process.

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-6h8x-6mph-7438
https://www.vulncheck.com/advisories/siyuan-before-3.8.4-path-traversal-via-setnotebookicon

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Source: NIST National Vulnerability Database (record CVE-2026-100638), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.