TI-2026-40133 Aliases CVE-2026-55596 GHSA-qj6x-xx2h-8hvv

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

HIGH 73CWE-79Published 2026-07-08 · Updated 2026-07-09

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: High · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00306 23rd percentileScored 2026-11-07

Fix Fixed plate (udecode): 53.1.4@platejs/media (npm): 53.1.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
udecode	plate	53.0.0 to before 53.1.4	53.1.4	Patch available	CNA
—	@platejs/media (npm)	53.0.0 to before 53.1.4	53.1.4	Patch available	GHSA-qj6x-xx2h-8hvv

plate Vendorudecode Affected 53.0.0 to before 53.1.4 Fixed in 53.1.4 Patch available CNA
@platejs/media (npm) Vendor— Affected 53.0.0 to before 53.1.4 Fixed in 53.1.4 Patch available GHSA-qj6x-xx2h-8hvv

Remediation

Fix · CNA plate (udecode) Fixed in 53.1.4
Fix · GHSA-qj6x-xx2h-8hvv @platejs/media (npm) Fixed in 53.1.4 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-55596
2026-10-03 Alias added: GHSA-qj6x-xx2h-8hvv

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-55596

Other 5

TI-2026-46915 Plate: SSRF with response disclosure in DOCX image embedding CVSS 3.1HIGH 8.2
TI-2023-17081 Cross site scripting (XSS) in @udecode/plate-link CVSS 3.1HIGH 8.1
TI-2024-31443 Arbitrary DOM attributes in element.attributes and leaf.attributes in Platejs CVSS 3.1HIGH 8.3
TI-2024-27043 Cross-site Scripting (XSS) in media embed element when using custom URL parsers in plate media CVSS 3.1HIGH 8.1
TI-2026-60308 @platejs/core HTML deserialization can trigger browser behavior during parsing CVSS 3.1MEDIUM 6.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences