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.

SeverityHigh

CVSS7.6

Exploit probability—

ProductSiyuan

PublishedSep 26, 2026

First seenSep 26, 2026

Weakness typeCWE-73CWE-73

How to fix

Update

siyuan-note siyuan3.8.4 or later

Vendor advisories

github.com/siyuan-note/siyuan/security/advisories/GHSA-jhmh-hr4g-c5g2

Affected products

Product	Affected versions	Fixed in
siyuan-note siyuan	v < 3.8.4	3.8.4

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