medium6.5
CVE-2026-85580
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.
Impact
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.
Affected products
| Product | Affected versions |
|---|---|
| SiYuan | before 3.8.2 |
Versions were read from the advisory text. No structured product data has been published for this record yet.