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CVE-2026-86712— SiYuan before 3.8.2 Remote Code Execution via Clipboard

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.

SiYuan是SiYuan团队开源的一个以隐私为先的个人知识管理系统。 SiYuan 3.8.2之前版本存在跨站脚本漏洞，该漏洞源于信任攻击者可写的text/siyuan剪贴板MIME类型并跳过粘贴处理器中的清理，可能导致在启用Node的桌面渲染器中执行代码，攻击者可构造恶意网页写入剪贴板，当粘贴到SiYuan时以完整Node.js权限通过Electron主进程执行注入脚本。

CVSS 8.8 · High EPSS 0.38% · P31

Affected Version Matrix 1

VendorProduct Version RangeStatus
siyuan-note siyuan < 3.8.2 affected
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I. Basic Information for CVE-2026-86712

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
SiYuan before 3.8.2 Remote Code Execution via Clipboard
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan before 3.8.2 trusts the attacker-writable text/siyuan clipboard MIME type and skips sanitization in the paste handler, allowing code execution in the Node-enabled desktop renderer. Attackers can craft malicious web pages that write to the clipboard, and when pasted into SiYuan, injected scripts execute with full Node.js access through the Electron main process.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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
Vulnerability Title
SiYuan 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SiYuan是SiYuan团队开源的一个以隐私为先的个人知识管理系统。 SiYuan 3.8.2之前版本存在跨站脚本漏洞，该漏洞源于信任攻击者可写的text/siyuan剪贴板MIME类型并跳过粘贴处理器中的清理，可能导致在启用Node的桌面渲染器中执行代码，攻击者可构造恶意网页写入剪贴板，当粘贴到SiYuan时以完整Node.js权限通过Electron主进程执行注入脚本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
siyuan-note siyuan 0 ~ 3.8.2 -

II. Public POCs for CVE-2026-86712

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III. Intelligence Information for CVE-2026-86712

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Patches & Fixes for CVE-2026-86712 (1)

Vendor Advisories for CVE-2026-86712 (2)

Proof of Concept for CVE-2026-86712 (1)

Vendor Pages for CVE-2026-86712 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-86712

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