CVE-2026-85580

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 Vector

References

• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-mmgw-3mx9-cfwp
• https://www.vulncheck.com/advisories/siyuan-before-3.8.2-path-guard-bypass-via-case-mismatch
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-mmgw-3mx9-cfwp