---
id: CVE-2026-116166
title: >-
  SiYuan 3.6.0 before 3.8.7 Cleartext Transmission via Unenforced
  networkServeTLS Setting
summary: >-
  SiYuan 3.6.0 before 3.8.7 accepts and persists the networkServeTLS setting but
  never enforces it, so the kernel port keeps serving full API access over plain
  HTTP alongside HTTPS. Network-adjacent attackers can sniff the cleartext login
  …
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-319
vendor: siyuan-note
product: siyuan
affected:
  - siyuan >= 3.6.0 < 3.8.7
published: '2026-10-25'
updated: '2026-10-25'
sourceUpdated: '2026-10-25T13:20:09.700Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-116166'
references:
  - url: >-
      https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hpj5-f7cj-vvwr
    label: GitHub Security Advisory (GHSA-hpj5-f7cj-vvwr)
  - url: >-
      https://www.vulncheck.com/advisories/siyuan-3.6.0-before-3.8.7-cleartext-transmission-via-unenforced-networkservetls-setting
    label: >-
      VulnCheck Advisory: SiYuan 3.6.0 before 3.8.7 Cleartext Transmission via
      Unenforced networkServeTLS Setting
tags:
  - cve.org
ingestedAt: '2026-10-25T22:08:29.948Z'
---

## Overview

SiYuan 3.6.0 before 3.8.7 accepts and persists the networkServeTLS setting but never enforces it, so the kernel port keeps serving full API access over plain HTTP alongside HTTPS. Network-adjacent attackers can sniff the cleartext login flow and session cookie, which lacks the Secure attribute while responses omit HSTS, to hijack kernel API sessions.

## Affected

- `siyuan >= 3.6.0 < 3.8.7`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.