CVE-2026-116168
SiYuan before v3.8.7 Path Traversal Local File Read via MCP Asset Tool
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| siyuan siyuan-note github.com/siyuan-note/siyuan/kernel
golang |
≥ 0; < 3.8.7 (affected, semver) 3.8.7 (unaffected, semver) Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 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 | CNA: 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 | CNA: VulnCheck |
| 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD: [email protected] |
| 3.1 / 6.2 medium |
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | NVD: [email protected] |
Exploit evidence
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-q768-4j87-gf3w
exploit · ADP: CISA-ADP
References
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-q768-4j87-gf3wCNA: VulnCheck · vendor-advisory
- https://www.vulncheck.com/advisories/siyuan-before-3.8.7-path-traversal-local-file-read-via-mcp-asset-toolCNA: VulnCheck · third-party-advisory
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-q768-4j87-gf3wADP: CISA-ADP · exploit
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-q768-4j87-gf3w[email protected]
- https://www.vulncheck.com/advisories/siyuan-before-3.8.7-path-traversal-local-file-read-via-mcp-asset-tool[email protected]
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-q768-4j87-gf3w134c704f-9b21-4f2e-91b3-4a467353bcc0
For agents and automation
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