CVE-2026-100637

high

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.

References

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

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-87731

Details

Source: Mitre, NVD

Published: 2026-09-26

Updated: 2026-10-05

Risk Information

CVSS v2

Base Score: 6.8

Vector: CVSS2#AV:N/AC:L/Au:M/C:N/I:C/A:P

Severity: Medium

CVSS v3

Base Score: 7.6

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

Severity: High

CVSS v4

Base Score: 8.3

Vector: 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

Severity: High

EPSS

EPSS: 0.00553