Is CVE-2026-55596 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-55596?

CVE-2026-55596 has a CVSS v3 severity of HIGH (8.7).

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CVE-2026-55596

Description

Plate is a rich-text editor with AI and shadcn/ui. From 53.0.0 until 53.1.4, the media embed renderer trusts serialized provider or sourceUrl metadata in useMediaState and skips parseMediaUrl protocol validation, allowing a crafted Plate document to set a known video provider while keeping url as a javascript: iframe source that the registry MediaEmbedElement renders directly as an iframe src when a victim opens the document. This issue is fixed in version 53.1.4.