All vulnerabilities
CVE-2026-100637GHSA-jhmh-hr4g-c5g2

SiYuan before v3.8.4 Path Traversal via checkoutRepo sessionID

siyuan-note siyuan
Open in ThreatlineRecord JSON
CVSS
8.3High
ExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 5 Oct 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.47%Chance of exploitation activity in the next 30 days, higher than 40% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in3.8.4Fixed versionCVE List
Published26 Sep 2026Updated 5 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 2

  • siyuanaffected: all versions before 3.8.4CVE List
  • siyuanunaffected: 3.8.4CVE List

References 2