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CVE-2026-66395— SiYuan Desktop before v3.7.2 Reflected XSS to RCE via siyuan Protocol

Quick assessment

Affected
siyuan-note siyuan
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

思源桌面版（SiYuan desktop）v3.7.2 之前的版本中，集市插件（bazaar plugin）的说明文件处理程序存在一个反射型跨站脚本漏洞。攻击者通过构造恶意的 siyuan:// 深度链接，可执行任意代码。具体而言，攻击者可以向插件名称（plugin name）参数中注入 HTML 载荷，这些载荷会在安全配置不当的 Electron 渲染进程中，通过 方法被渲染并执行，从而获得完整的 Node.js 访问权限。

CVSS 9.6 · Critical EPSS 0.56% · P46

Affected Version Matrix 2

VendorProduct Version RangeStatus
siyuan-note siyuan < 3.7.2 affected
3.7.2 unaffected
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I. Basic Information for CVE-2026-66395

Vulnerability Information
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Vulnerability Title
SiYuan Desktop before v3.7.2 Reflected XSS to RCE via siyuan Protocol
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan desktop before v3.7.2 contains a reflected cross-site scripting vulnerability in the bazaar plugin readme handler that allows attackers to execute arbitrary code by crafting a malicious siyuan:// deep link. Attackers can inject HTML payloads via the plugin name parameter that execute with full Node.js access through insertAdjacentHTML rendering in an insecurely configured Electron renderer.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
siyuan-note siyuan 0 ~ 3.7.2 -

II. Public POCs for CVE-2026-66395

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6408 chars
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III. Intelligence Information for CVE-2026-66395

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Vendor Advisories for CVE-2026-66395 (2)

Same Patch Batch · siyuan-note · 2026-07-27 · 3 CVEs total

CVE-2026-66394 8.7 HIGH SiYuan before v3.7.3 Stored and Reflected XSS via SVG Sanitizer Bypass
CVE-2026-66396 8.4 HIGH SiYuan before v3.7.2 Stored XSS to RCE via title-img IAL

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-79

V. Comments for CVE-2026-66395

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