Vulnerability-Lookup

CVE-2026-55596 (GCVE-0-2026-55596)

Vulnerability from cvelistv5 – Published: 2026-07-08 20:27 – Updated: 2026-07-09 13:41

Title

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

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.

Severity

8.7 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-09 13:40 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/udecode/plate/security/advisor…	x_refsource_CONFIRM
https://github.com/udecode/plate/pull/5014	x_refsource_MISC
https://github.com/udecode/plate/commit/6214914ca…	x_refsource_MISC
https://github.com/udecode/plate/releases/tag/v53.1.4	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
udecode	plate	Affected: >= 53.0.0, < 53.1.4	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-55596

Vulnerability from fkie_nvd - Published: 2026-07-08 21:16 - Updated: 2026-07-10 19:06

Severity

8.7 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/udecode/plate/commit/6214914ca811adf22d0ad503154494216eed68ba
	security-advisories@github.com	https://github.com/udecode/plate/pull/5014
	security-advisories@github.com	https://github.com/udecode/plate/releases/tag/v53.1.4
	security-advisories@github.com	https://github.com/udecode/plate/security/advisories/GHSA-qj6x-xx2h-8hvv
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/udecode/plate/security/advisories/GHSA-qj6x-xx2h-8hvv

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "affected": [
    {
      "affectedData": [
        {
          "product": "plate",
          "vendor": "udecode",
          "versions": [
            {
              "status": "affected",
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    }
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GHSA-QJ6X-XX2H-8HVV

Vulnerability from github – Published: 2026-08-25 16:29 – Updated: 2026-08-25 16:29

Summary

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

Details

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 document in an app using the registry media embed component, the component renders the attacker URL directly as an iframe src.

Impact

An attacker who can create or share Plate document content with another user can execute JavaScript in the victim browser context when the victim opens the document. This can expose application data available to the page and perform actions as the victim, depending on the host application's session model.

Reproduction

Use a Plate editor or viewer that renders media embeds with the registry MediaEmbedElement and load a document containing this node:

{
  "type": "media_embed",
  "provider": "vimeo",
  "sourceUrl": "https://vimeo.com/1",
  "url": "javascript:parent.postMessage('plate-media-xss','*')",
  "children": [{ "text": "" }]
}

When rendered, the node is treated as a Vimeo media embed because provider is present. The iframe receives the unvalidated url value as its src.

Root Cause / Technical Details

parseMediaUrl is the intended hardening point for media embed URLs and rejects parser output unless the URL protocol is http: or https:. However, useMediaState had a fast path for serialized nodes that already contain provider or sourceUrl. That fast path returned { id, provider, sourceUrl, url } directly and did not call parseMediaUrl or otherwise validate the stored url.

The registry MediaEmbedElement then checks that embed.provider is one of the video providers and renders non-YouTube video providers with <iframe src={embed.url}>. Because provider is attacker-controlled serialized document metadata, it can be set to vimeo while url remains javascript:....

This is fixed in @platejs/media 53.1.4 by recomputing embed metadata from the render URL instead of trusting serialized provider, id, or sourceUrl metadata.

PoC Evidence

A browser proof using the same data flow set an iframe src to:

javascript:parent.postMessage('plate-media-xss','*')

Chromium executed the iframe JavaScript and the parent page received plate-media-xss, confirming execution from the iframe source.

Remediation

Upgrade @platejs/media to 53.1.4 or later. Treat provider, sourceUrl, and id in serialized documents as untrusted derived metadata. Recompute embed metadata from url with parseMediaUrl, or at minimum validate any fast-path url with the same protocol allowlist before rendering an iframe.

Severity

8.7 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@platejs/media"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "53.0.0"
            },
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-55596"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-25T16:29:25Z",
    "nvd_published_at": "2026-07-08T21:16:50Z",
    "severity": "HIGH"
  },
  "details": "## Summary\n\nThe 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 document in an app using the registry media embed component, the component renders the attacker URL directly as an iframe `src`.\n\n## Impact\n\nAn attacker who can create or share Plate document content with another user can execute JavaScript in the victim browser context when the victim opens the document. This can expose application data available to the page and perform actions as the victim, depending on the host application\u0027s session model.\n\n## Reproduction\n\nUse a Plate editor or viewer that renders media embeds with the registry `MediaEmbedElement` and load a document containing this node:\n\n```json\n{\n  \"type\": \"media_embed\",\n  \"provider\": \"vimeo\",\n  \"sourceUrl\": \"https://vimeo.com/1\",\n  \"url\": \"javascript:parent.postMessage(\u0027plate-media-xss\u0027,\u0027*\u0027)\",\n  \"children\": [{ \"text\": \"\" }]\n}\n```\n\nWhen rendered, the node is treated as a Vimeo media embed because `provider` is present. The iframe receives the unvalidated `url` value as its `src`.\n\n## Root Cause / Technical Details\n\n`parseMediaUrl` is the intended hardening point for media embed URLs and rejects parser output unless the URL protocol is `http:` or `https:`. However, `useMediaState` had a fast path for serialized nodes that already contain `provider` or `sourceUrl`. That fast path returned `{ id, provider, sourceUrl, url }` directly and did not call `parseMediaUrl` or otherwise validate the stored `url`.\n\nThe registry `MediaEmbedElement` then checks that `embed.provider` is one of the video providers and renders non-YouTube video providers with `\u003ciframe src={embed.url}\u003e`. Because `provider` is attacker-controlled serialized document metadata, it can be set to `vimeo` while `url` remains `javascript:...`.\n\nThis is fixed in `@platejs/media` 53.1.4 by recomputing embed metadata from the render URL instead of trusting serialized `provider`, `id`, or `sourceUrl` metadata.\n\n## PoC Evidence\n\nA browser proof using the same data flow set an iframe `src` to:\n\n```text\njavascript:parent.postMessage(\u0027plate-media-xss\u0027,\u0027*\u0027)\n```\n\nChromium executed the iframe JavaScript and the parent page received `plate-media-xss`, confirming execution from the iframe source.\n\n## Remediation\n\nUpgrade `@platejs/media` to 53.1.4 or later. Treat `provider`, `sourceUrl`, and `id` in serialized documents as untrusted derived metadata. Recompute embed metadata from `url` with `parseMediaUrl`, or at minimum validate any fast-path `url` with the same protocol allowlist before rendering an iframe.",
  "id": "GHSA-qj6x-xx2h-8hvv",
  "modified": "2026-08-25T16:29:25Z",
  "published": "2026-08-25T16:29:25Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/udecode/plate/security/advisories/GHSA-qj6x-xx2h-8hvv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55596"
    },
    {
      "type": "WEB",
      "url": "https://github.com/udecode/plate/pull/5014"
    },
    {
      "type": "WEB",
      "url": "https://github.com/udecode/plate/commit/6214914ca811adf22d0ad503154494216eed68ba"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/udecode/plate"
    },
    {
      "type": "WEB",
      "url": "https://github.com/udecode/plate/releases/tag/v53.1.4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Plate: Media embed provider metadata can bypass URL sanitization and execute iframe JavaScript"
}

Sightings

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Action not permitted

CVE-2026-55596 (GCVE-0-2026-55596)

FKIE_CVE-2026-55596

GHSA-QJ6X-XX2H-8HVV

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