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CVE-2026-116168— SiYuan before v3.8.7 Path Traversal Local File Read via MCP Asset Tool

Quick assessment

Affected
siyuan-note siyuan
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SiYuan 3.8.7 之前的版本中，MCP 资产工具存在路径遍历漏洞。该漏洞源于 函数依赖一个不完整的敏感路径黑名单，遗漏了 及其他秘密文件。已认证的攻击者可利用 MCP 资产上传功能，将此类本地文件复制到工作区，随后通过 HTTP 协议访问 路径将其读取。

CVSS 6.2 · Medium

Affected Version Matrix 2

VendorProduct Version RangeStatus
siyuan-note siyuan < 3.8.7 affected
3.8.7 unaffected
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I. Basic Information for CVE-2026-116168

Vulnerability Information
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Vulnerability Title
SiYuan before v3.8.7 Path Traversal Local File Read via MCP Asset Tool
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
siyuan-note siyuan 0 ~ 3.8.7 -

II. Public POCs for CVE-2026-116168

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III. Intelligence Information for CVE-2026-116168

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Vendor Advisories for CVE-2026-116168 (2)

Same Patch Batch · siyuan-note · 2026-10-25 · 6 CVEs total

CVE-2026-116171 7.5 HIGH SiYuan 3.5.4 before 3.8.7 Sensitive Path Bypass via Windows Extended-Length Prefix
CVE-2026-116167 6.8 MEDIUM SiYuan 2.9.0 before 3.8.7 XSS via check-auth to Parameter
CVE-2026-116166 6.8 MEDIUM SiYuan 3.6.0 before 3.8.7 Cleartext Transmission via Unenforced networkServeTLS Setting
CVE-2026-116169 5.4 MEDIUM SiYuan 2.10.0 before 3.8.7 Stored XSS via KaTeX \href in Math Blocks
CVE-2026-116170 4.9 MEDIUM SiYuan before v3.8.7 SQL Injection via History Search op and query

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-22