---
id: CVE-2026-116687
aliases:
  - GHSA-v6mg-96c6-gmpq
title: 'CKEditor: Cross-site scripting (XSS) in the engine package'
summary: 'CKEditor: Cross-site scripting (XSS) in the engine package'
severity: low
cvss: 3.1
cwe:
  - CWE-79
vendor: ckeditor5
product: ckeditor5
ecosystem: npm
affected:
  - 'ckeditor5 >= 29.0.0, < 47.7.4'
  - '@ckeditor/ckeditor5-engine >= 29.0.0, < 47.7.4'
  - 'ckeditor5 >= 48.0.0, < 48.5.1'
  - '@ckeditor/ckeditor5-engine >= 48.0.0, < 48.5.1'
patched:
  - ckeditor5 47.7.4
  - '@ckeditor/ckeditor5-engine 47.7.4'
  - ckeditor5 48.5.1
  - '@ckeditor/ckeditor5-engine 48.5.1'
published: '2026-10-27'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T21:05:13Z'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-v6mg-96c6-gmpq'
references:
  - url: >-
      https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-v6mg-96c6-gmpq
  - url: >-
      https://github.com/ckeditor/ckeditor5/commit/4d9c5bb34f63cd956d15ccafbe584e14280c86a0
  - url: >-
      https://github.com/ckeditor/ckeditor5/commit/a750e38635db6a18c5b11599c09f4fd702850423
  - url: 'https://github.com/ckeditor/ckeditor5/releases/tag/v47.7.4'
  - url: 'https://github.com/ckeditor/ckeditor5/releases/tag/v48.5.1'
  - url: 'https://github.com/advisories/GHSA-v6mg-96c6-gmpq'
tags:
  - ghsa
  - npm
  - cve.org
ingestedAt: '2026-10-27T19:54:27.803Z'
---

## Overview

### Impact
A Cross-Site Scripting (XSS) vulnerability has been discovered in the CKEditor 5 engine. This vulnerability could be triggered by inserting specially crafted markup under a specific General HTML Support configuration that allows inserting objects, leading to unauthorized JavaScript code execution in a browser context isolated from the origin of the application embedding the editor.

This vulnerability affects only installations where General HTML Support is enabled and configured to allow the affected HTML content.

### Patches
The problem has been recognized and patched. The fix will be available in version `48.5.1` (and above) and `47.7.4` (LTS).

### For more information
Email us at [security@cksource.com](mailto:security@cksource.com) if you have any questions or comments about this advisory.

## Affected packages

- `ckeditor5 >= 29.0.0, < 47.7.4`
- `@ckeditor/ckeditor5-engine >= 29.0.0, < 47.7.4`
- `ckeditor5 >= 48.0.0, < 48.5.1`
- `@ckeditor/ckeditor5-engine >= 48.0.0, < 48.5.1`

## Remediation

Upgrade to a patched release:

- `ckeditor5 47.7.4`
- `@ckeditor/ckeditor5-engine 47.7.4`
- `ckeditor5 48.5.1`
- `@ckeditor/ckeditor5-engine 48.5.1`