CVE-2026-66395

Critical

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.

SeverityCritical

CVSS9.6

Exploit probability—

ProductSiyuan

PublishedJul 27, 2026

First seenJul 27, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

siyuan-note siyuan3.7.2 or later

Vendor advisories

github.com/siyuan-note/siyuan/security/advisories/GHSA-6gx2-8gcr-x83f

Affected products

Product	Affected versions	Fixed in
siyuan-note siyuan	v < 3.7.2	3.7.2

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.