Is CVE-2026-66396 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-66396?

CVE-2026-66396 has a CVSS v3 severity of HIGH (8.4).

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CVE-2026-66396

Description

SiYuan before v3.7.2 fails to escape the title-img Individual Attribute List value when rendering Gallery and Kanban cover images, allowing stored cross-site scripting via unescaped style attribute interpolation. Attackers with editor permissions can inject onload handlers that execute arbitrary code in the Electron renderer with full Node.js access when victims open affected documents.