Vulnerability · Published Jul 8, 2026 · Assigned by GitHub_M

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

High 8.7

In plain English

A high-severity cross-site scripting in plate from udecode. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.7High

Exploit odds (30 days)0.3%top 76.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@platejs/media	53.1.4	GHSA-qj6x-xx2h-8hvv

Affected products (as reported)

Vendor	Product	Versions
udecode	plate	>= 53.0.0, < 53.1.4

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

References

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