CVE-2026-116168
SiYuan before v3.8.7 Path Traversal Local File Read via MCP Asset Tool
- State
- Published
- Severity
- 6.9 Medium
- Published
- Oct 25, 2026
- Updated
- Oct 25, 2026
- Reserved
- Oct 25, 2026
Description
SiYuan before 3.8.7 contains a path traversal vulnerability in the MCP asset tool because validateAssetUploadPaths relies on an incomplete sensitive-path blacklist that omits .env and other secret files. Authenticated attackers driving the MCP asset upload action can copy such local files into the workspace and read them back via /assets/ over HTTP.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 6.2 Medium | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | VulnCheck |
Weaknesses
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Products
| Product | Versions |
|---|---|
siyuansiyuan-note |
|
References
- GitHub Security Advisory (GHSA-q768-4j87-gf3w)vendor-advisory
- VulnCheck Advisory: SiYuan before v3.8.7 Path Traversal Local File Read via MCP Asset Toolthird-party-advisory
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