---
id: CVE-2026-65606
title: >-
  SiYuan before v3.7.2 contains a cross-site scripting vulnerability in the
  siyuan:// protocol handler
summary: >-
  SiYuan before v3.7.2 contains a cross-site scripting vulnerability in the
  siyuan:// protocol handler. When a siyuan://plugins/<name> link references a
  name that is not an installed plugin, the application opens a custom tab and
  inserts t…
severity: critical
cvss: 9.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H'
cwe:
  - CWE-79
vendor: siyuan-note
product: siyuan
affected:
  - siyuan < 3.7.2
published: '2026-07-23'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T18:17:01.133'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-65606'
references:
  - url: >-
      https://github.com/siyuan-note/siyuan/commit/41f2861c87575ff5ac4b50a0520b1a4fe55b4a70
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/siyuan-note/siyuan/security/advisories/GHSA-wp64-x7qh-h728
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/siyuan-before-cross-site-scripting-to-rce
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/siyuan-note/siyuan/security/advisories/GHSA-wp64-x7qh-h728
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-07-23T15:48:00.697371Z'
epss: 0.0079
epssPercentile: 0.54316
ingestedAt: '2026-09-17T18:25:15.979Z'
---

## Overview

SiYuan before v3.7.2 contains a cross-site scripting vulnerability in the siyuan:// protocol handler. When a siyuan://plugins/<name> link references a name that is not an installed plugin, the application opens a custom tab and inserts the link's icon parameter into the tab header via innerHTML without escaping it (app/src/layout/Tab.ts), allowing injection of an <img onerror=...> element. Because the SiYuan Desktop renderer runs with nodeIntegration:true, the injected JavaScript can access Node's require and call require('child_process').execSync(...), escalating the cross-site scripting into arbitrary operating-system command execution.

## Remediation

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