CVE-2026-116171GHSA-6gmc-424x-xgpm

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

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Open in Threatline Record JSON

CVSS

8.7High

ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV

Exploit odds (EPSS)No scoreNo FIRST EPSS score in this snapshot yet

Fixed in3.8.7Fixed versionCVE List

Published25 Oct 2026Updated 25 Oct 2026CVE List

What fixes it

3.8.7siyuanCVE List

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

Reports 1

1 outlet mention it. Reports are not confirmation; each links to its source.

🚨 CVE-2026-116171 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 matcheTelegram: CVE Notify, 25 Oct 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.

Text from CVE List

Affected versions 2

siyuanaffected: 3.5.4 before 3.8.7CVE List
siyuanunaffected: 3.8.7CVE List