CVE-2026-116171

SiYuan 3.5.4 before 3.8.7 Sensitive Path Bypass via Windows Extended-Length Prefix

State: Published
Severity: 5.9 Medium
Published: Oct 25, 2026
Updated: Oct 28, 2026
Reserved: Oct 25, 2026

Description

SiYuan 3.5.4 before 3.8.7 on Windows contains a sensitive-path denylist bypass in IsSensitivePath because the Windows extended-length prefix (\\?\) survives filepath.Clean and matches no forbidden prefix. Authenticated API callers can prepend the prefix to localPath in /api/import/importStdMd to copy workspace conf files, including the API token and TLS private keys, into assets served to unauthenticated clients.

Scores

CVSS	Score	Vector	Source
4.0	5.9 Medium	CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N	VulnCheck
3.1	4.4 Medium	CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N	VulnCheck

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Affected Products

Product	Versions
siyuansiyuan-note	3.5.4 to before 3.8.7Affected 3.8.7Not affected

References

GitHub Security Advisory (GHSA-6gmc-424x-xgpm)vendor-advisory
VulnCheck Advisory: SiYuan 3.5.4 before 3.8.7 Sensitive Path Bypass via Windows Extended-Length Prefixthird-party-advisory

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