What’s Vulnerable › Vulnerabilities

CVE-2026-55596: Plate: Media embed provider metadata can bypass URL sanitization and execute iframe JavaScript

• Severity: high (CVSS 8.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-08 · updated 2026-10-25
• Weakness: CWE-79

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.

Affected products

• udecode plate: from 53.0.0, < 53.1.4

References

• https://github.com/udecode/plate/commit/6214914ca811adf22d0ad503154494216eed68ba
• https://github.com/udecode/plate/pull/5014
• https://github.com/udecode/plate/releases/tag/v53.1.4
• https://github.com/udecode/plate/security/advisories/GHSA-qj6x-xx2h-8hvv
• https://github.com/udecode/plate/security/advisories/GHSA-qj6x-xx2h-8hvv

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