CVE-2026-100636CWE-22path-traversal

CVE-2026-100636

High · published September 26, 2026

CVSS v3.1
7.6
EPSS
1%
Percentile
44.9
In the wild
Unconfirmed
What it is

SiYuan versions before v3.8.4 contain a path traversal vulnerability in the exportBrowserHTML endpoint that allows authenticated administrators to write arbitrary HTML content to index.html outside the workspace directory. Attackers can supply a folder parameter with directory traversal sequences to escape the export directory and overwrite index.html in any pre-existing kernel-writable location, enabling stored XSS or workspace defacement.

The record
Technical detail
CVSS v3.1
7.6 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:L
CVSS v4.0
8.3 · 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
EPSS
0.00544 · 44.9th percentile
Weakness
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Published
2026-09-26T18:16Z
References (3)
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-jf98-m24w-gm9m · [email protected]https://www.vulncheck.com/advisories/siyuan-before-3.8.4-path-traversal-via-exportbrowserhtml-folder · [email protected]https://github.com/siyuan-note/siyuan/security/advisories/GHSA-jf98-m24w-gm9m · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 28 SEP 03:25Z
    EPSS moved — → 1%
    epss
  • 26 SEP 13:23Z
    SiYuan before v3.8.4 Path Traversal via exportBrowserHTML folder
    cvelistv5