Is CVE-2026-66395 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-66395?

CVE-2026-66395 has a CVSS v3 severity of CRITICAL (9.6).

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CVE-2026-66395

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.