CVE-2026-85580: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in siyuan-note siyuan
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.
CVE-2026-85580: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in siyuan-note siyuan
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.
CVSS v4.0
Score 7.1high
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-04T10:56:22.464Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a9aad9eacd9273b4981d6e7
Added to database: 09/04/2026, 11:38:06 UTC
Last updated: 09/04/2026, 23:27:27 UTC
Views: 9
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