Vulnerability · Published Sep 8, 2026 · Assigned by VulnCheck

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

High 8.8

In plain English

A high-severity cross-site scripting in siyuan from siyuan-note. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.7%top 46.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
siyuan-note	siyuan	0 – before 3.8.2

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

GitHub Security Advisory (GHSA-9rr9-pxr4-gcgc) vendor-advisory
Patch Commit patch
SiYuan v3.8.2 Release Notes release-notes
Lute.Sanitize runs only in the if (!siyuanHTML) branch, v3.8.1 technical-description
https://github.com/siyuan-note/siyuan product
VulnCheck Advisory: SiYuan before 3.8.2 Remote Code Execution via Clipboard third-party-advisory