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. Attackers can read the protected publishAccess.json file by requesting case-variant paths like PublishAccess.json to disclose sensitive publish-access configuration and metadata.
- Score
- CVSS 4.0 7.1 High
- Status
- Deferred - disclosure@vulncheck.com
- Published
- 2026-09-04
- Last modified
- 2026-09-04
- Weaknesses
- CWE-22
Affected products
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
