What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-27 · updated 2026-10-24
• Weakness: CWE-79

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.

Affected products

• siyuan-note siyuan: before 3.7.2 — fixed in 3.7.2

How to fix

Upgrade to a fixed version: siyuan-note siyuan 3.7.2. Check the vendor advisory for mitigations.

References

• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-6gx2-8gcr-x83f
• https://www.vulncheck.com/advisories/siyuan-desktop-before-reflected-xss-to-rce-via-siyuan-protocol
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-6gx2-8gcr-x83f

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