Plate: Media embed provider metadata can bypass URL sanitization and execute iframe JavaScript

Summary The media embed renderer trusts serialized provider or sourceUrl metadata and skips the URL protocol validation that normally blocks unsafe media embed URLs. A crafted Plate document can set a known video provider while keeping url as a javascript: iframe source. When a victim opens that...

GHSA-QJ6X-XX2H-8HVV Plate: Media embed provider metadata can bypass URL sanitization and execute iframe JavaScript

Summary The media embed renderer trusts serialized provider or sourceUrl metadata and skips the URL protocol validation that normally blocks unsafe media embed URLs. A crafted Plate document can set a known video provider while keeping url as a javascript: iframe source. When a victim opens that...