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Published: 12 August 2021

ckeditor is an open source WYSIWYG HTML editor with rich content support. A vulnerability has been discovered in the clipboard Widget plugin if used alongside the undo feature. The vulnerability allows a user 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. The problem has been recognized and patched. The fix will be available in version 4.16.2.



CVSS 3 base score: 5.4


Package Release Status
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
focal Not vulnerable
(code not present)
hirsute Ignored
(reached end-of-life)
Released (4.16.0+dfsg-2ubuntu0.1)
jammy Not vulnerable
trusty Does not exist

upstream Not vulnerable
xenial Ignored
(out of standard support)