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Vulnerability record · CVE-2026-86712 · published 8 September 2026

CVE-2026-86712: Cross-site scripting vulnerability

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.

8.6 CVSS 4.0 High EPSS 0.72% · top 48.2% CWE-79 · Cross-site scripting Deferred
8.6CVSS 4.0 base score
0.72%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
10 Sep 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/siyuan-note/siyuan
https://github.com/siyuan-note/siyuan/blob/v3.8.1/app/src/protyle/util/paste.ts
https://github.com/siyuan-note/siyuan/commit/9ce660652de2ced26ec2d98a5a242cb0b8bb7273
https://github.com/siyuan-note/siyuan/releases/tag/v3.8.2
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-9rr9-pxr4-gcgc
https://www.vulncheck.com/advisories/siyuan-before-3.8.2-remote-code-execution-via-clipboard

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Source: NIST National Vulnerability Database (record CVE-2026-86712), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.