Medium severity · published Oct 25, 2026
CVE-2026-116168
SiYuan before v3.8.7 Path Traversal Local File Read via MCP Asset Tool
New
6.2
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 8% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SI
siyuan · siyuan-note
before 3.8.7 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-116168
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-116168
github.com
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-q768-4j87-gf3w
www.vulncheck.com
https://www.vulncheck.com/advisories/siyuan-before-3.8.7-path-traversal-local-file-read-via-mcp-asset-tool
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