Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ckeditor | ckeditor4 | >= 4.13.0, < 4.16.2 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 12 | ckeditor | 4.16.2+dfsg-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | ckeditor | 4.12.1+dfsg-1ubuntu0.1 | USN-5340-1 |
| Ubuntu 18.04 LTS | ckeditor | 4.5.7+dfsg-2ubuntu0.18.04.1 | USN-5340-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | ckeditor4 | >= 4.13.0, < 4.16.2 | 4.16.2 | GHSA-6226-h7ff-ch6c |
Advisories 1
- USN-5340-1 ckeditor vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
References
- https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-6226-h7ff-ch6c
- https://github.com/ckeditor/ckeditor4/releases/tag/4.16.2
- FEDORA-2021-51457da891 vendor-advisory
- FEDORA-2021-72176a63a8 vendor-advisory
- FEDORA-2021-87578dca12 vendor-advisory
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://www.oracle.com/security-alerts/cpujan2022.html