Not a U.S. government website. NDD is an independent vulnerability database by Volerion and is not affiliated with or endorsed by NIST or NVD.

CVE-2026-85580 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

SiYuan versions before v3.8.2 contain a path guard bypass vulnerability in the MCP file-access handler that uses case-sensitive matching on Linux filesystems. Attackers can read the protected publishAccess.json file by requesting case-variant paths like PublishAccess.json to disclose sensitive publish-access configuration and metadata.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:2.9 LOWVector:CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

CNA: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URL	Source(s)	Tag(s)
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-mmgw-3mx9-cfwp	CISA-ADP	AdvisoryExploitRemedyVendor
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-mmgw-3mx9-cfwp	[email protected]	AdvisoryExploitRemedyVendor
https://www.vulncheck.com/advisories/siyuan-before-3.8.2-path-guard-bypass-via-case-mismatch	[email protected]	Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-22	Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')	[email protected]

Affected Products

Product	Versions
SiYuan	< 3.8.2 (semver)
CPE No CPEs found in CPE dictionary for this product. Remediation Upgrade: 3.8.2moderate effort

Change History

2 change records found show changes

Date	Action	Recorded By
Sep 4, 2026	CVE Modified	CISA-ADP
Sep 4, 2026	New CVE Received	[email protected]