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GHSA-v6mg-96c6-gmpq

CKEditor: Cross-site scripting (XSS) in the engine package

Source: GitHub Advisory Database (reviewed) Low CVE-2026-116687

Packages

EcosystemPackageAffectedFixed in
npm ckeditor5 >= 29.0.0, < 47.7.4 47.7.4
npm @ckeditor/ckeditor5-engine >= 29.0.0, < 47.7.4 47.7.4
npm ckeditor5 >= 48.0.0, < 48.5.1 48.5.1
npm @ckeditor/ckeditor5-engine >= 48.0.0, < 48.5.1 48.5.1

Details

As written in the advisory (Markdown source, shown as plain text).

### 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 [[email protected]](mailto:[email protected]) if you have any questions or comments about this advisory.

References

External links from the advisory. They lead to third-party sites.