---
id: CVE-2026-100638
title: >-
  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
summary: >-
  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 c…
severity: high
cvss: 7.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:L'
cwe:
  - CWE-73
vendor: siyuan-note
product: siyuan
affected:
  - siyuan < 3.8.4
published: '2026-09-26'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T14:16:45.590'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100638'
references:
  - url: >-
      https://github.com/siyuan-note/siyuan/security/advisories/GHSA-6h8x-6mph-7438
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/siyuan-before-3.8.4-path-traversal-via-setnotebookicon
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-26T13:33:20.923Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.