Vulnerability advisory

GHSA-7889-rm5j-hpgg

Clipboard feature vulnerability allowing to inject arbitrary HTML into the editor using paste functionality

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

Also known as CVE-2021-32809

Severity

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

Affected versions

ckeditor4 npm

All ckeditor4 advisories →

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

Description

Affected packages

The vulnerability has been discovered in clipboard plugin. All plugins with clipboard plugin dependency are affected:

Impact

A potential vulnerability has been discovered in CKEditor 4 Clipboard package. The vulnerability allowed to abuse paste functionality using malformed HTML, which could result in injecting arbitrary HTML into the editor. It affects all users using the CKEditor 4 plugins listed above at version >= 4.5.2.

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.