Medium severity6.5NVD Advisory· Published Sep 4, 2026

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Siyuan Note/Siyuanllm-fuzzy
Range: <3.8.2

Patches

Vulnerability mechanics

References

github.com/siyuan-note/siyuan/security/advisories/GHSA-mmgw-3mx9-cfwpnvd
www.vulncheck.com/advisories/siyuan-before-3.8.2-path-guard-bypass-via-case-mismatchnvd

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cvss	0.423
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000