Vulnerability advisory

GHSA-6226-h7ff-ch6c

Widget feature vulnerability allowing to execute JavaScript code using undo functionality

Published Aug 23, 2021Updated Jul 8, 2026OSV record ↗

Also known as CVE-2021-32808

Severity

CVSS 3.xCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N

Affected versions

ckeditor4 npm

All ckeditor4 advisories →

Affected	Fixed in
`4.13.0` to before 4.16.2	`4.16.2`Advisories →

Description

Affected packages

The vulnerability has been discovered in Widget plugin if used alongside Undo feature.

Impact

A potential vulnerability has been discovered in CKEditor 4 Widget package. The vulnerability allowed to abuse undo functionality using malformed widget HTML, which could result in executing JavaScript code. It affects all users using the CKEditor 4 plugins listed above at version >= 4.13.0.

Patches

The problem has been recognized and patched. The fix will be available in version 4.16.2.

For more information

Email us at security@cksource.com if you have any questions or comments about this advisory.

Acknowledgements

The CKEditor 4 team would like to thank Anton Subbotin (skavans) for recognizing and reporting this vulnerability.