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CVE-2026-116168

SiYuan before v3.8.7 Path Traversal Local File Read via MCP Asset Tool

MEDIUM
6.2
CVSS Score
Published: October 25, 2026 at 01:20 PM UTC
Updated: October 25, 2026 at 03:17 PM UTC
1 product affected across 1 vendorSiyuan

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Severity
MEDIUM6.2
Exploit prediction
EPSS 0.2%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Siyuan· Siyuan Notego
90%
All versions
Vendor states this is fixed in 3.8.7 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisory
Source: cverecord
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-q768-4j87-gf3w
Third Party Advisory
Source: cverecord
https://www.vulncheck.com/advisories/siyuan-before-3.8.7-path-traversal-local-file-read-via-mcp-asset-tool

CVSS

6.2MEDIUMVulnCheck
Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-22

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