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CVE-2026-116171— SiYuan 3.5.4 before 3.8.7 Sensitive Path Bypass via Windows Extended-Length Prefix

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.

在 Windows 系统上，SiYuan 3.5.4 至 3.8.7（不含 3.8.7）版本存在敏感路径拒绝列表绕过漏洞。该漏洞源于 函数未能正确处理 Windows 扩展长度路径前缀（ ）：该前缀在 处理后得以保留，且无法匹配任何被禁止的前缀规则。已认证的 API 调用者可在 接口的 参数前添加此前缀，从而将工作区配置文件（包括 API 令牌和 TLS 私钥）复制到面向未认证客户端提供的静态资源中。

CVSS 7.5 · High

Affected Version Matrix 2

VendorProduct Version RangeStatus
siyuan-note siyuan 3.5.4< 3.8.7 affected
3.8.7 unaffected
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I. Basic Information for CVE-2026-116171

Vulnerability Information
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Vulnerability Title
SiYuan 3.5.4 before 3.8.7 Sensitive Path Bypass via Windows Extended-Length Prefix
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan 3.5.4 before 3.8.7 on Windows contains a sensitive-path denylist bypass in IsSensitivePath because the Windows extended-length prefix (\\?\) survives filepath.Clean and matches no forbidden prefix. Authenticated API callers can prepend the prefix to localPath in /api/import/importStdMd to copy workspace conf files, including the API token and TLS private keys, into assets served to unauthenticated clients.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/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 3.5.4 ~ 3.8.7 -

II. Public POCs for CVE-2026-116171

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III. Intelligence Information for CVE-2026-116171

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Vendor Advisories for CVE-2026-116171 (2)

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

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-2026-116168 6.2 MEDIUM SiYuan before v3.8.7 Path Traversal Local File Read via MCP Asset Tool
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