CVE-2026-100637

HIGHCVSS 7.6

Description

SiYuan versions before v3.8.4 contain a path traversal vulnerability in the checkoutRepo endpoint that allows authenticated administrators to write JSON files outside the workspace. Attackers can supply a sessionID parameter containing directory traversal sequences to overwrite arbitrary JSON files in pre-existing kernel-writable directories outside workspace boundaries.

Timeline

Published:September 26th, 2026 2:16 PM

Last modified:October 5th, 2026 4:17 PM

CVSS Scoring

CVSS v3: 7.6 (HIGH)

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:L

Weaknesses (CWE)

CWE-73

References & Reports

Advisories, patches, and third-party reports

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-jhmh-hr4g-c5g2
https://www.vulncheck.com/advisories/siyuan-before-3.8.4-path-traversal-via-checkoutrepo-sessionid
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-jhmh-hr4g-c5g2

Source: NIST NVD · Data may lag official sources by up to one minute