---
id: "CVE-2026-116171"
kind: "vulnerability"
aliases: ["CVE-2026-116171"]
title: "SiYuan on Windows: path check bypass exposes API token and TLS keys"
severity: "high"
cvss: 8.7
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["package", "self-hosted", "siyuan", "windows"]
not_affected_if: ["auth-required", "non-windows", "single-user-desktop"]
published_at: "2026-10-25T14:16:56+00:00"
first_seen_at: "2026-10-25T14:41:23+00:00"
updated_at: "2026-10-25T14:42:17+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116171", "first_seen_at": "2026-10-25T14:41:23+00:00"}]
---

# SiYuan on Windows: path check bypass exposes API token and TLS keys

On Windows, SiYuan 3.5.4 before 3.8.7 fails to block paths that use the extended-length prefix (\\?\), so its sensitive-path check misses them. An authenticated API caller can copy workspace config files, including the API token and TLS private keys, into assets that unauthenticated clients can fetch.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Run `SiYuan --version` or check the installed version in the app's About dialog; versions from `3.5.4` up to but not including `3.8.7` are affected
- Confirm the host runs Windows and that SiYuan is reachable by other users or the network

## Fix

- Upgrade SiYuan to `3.8.7` or later
- Rotate the SiYuan API token and any TLS private keys if the instance ran an affected version and was reachable by untrusted authenticated users

## Timeline

- 2026-10-25T14:41:23+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116171

## From the sources

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.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_