CKEditor4 Cross-site Scripting vulnerability in samples with enabled the preview feature
Published 7 Feb 2024 · Updated 10 Sept 2026
Affected package
- Affected
- <4.24.0-lts
- Fixed in
- 4.24.0-lts
npm install ckeditor4@4.24.0-ltsDetails
Affected packages
The vulnerability has been discovered in the samples that use the preview feature:
samples/old/**/*.htmlplugins/[plugin name]/samples/**/*.html
All integrators that use these samples in the production code can be affected.
Impact
A potential vulnerability has been discovered in one of CKEditor's 4 samples that are shipped with production code. The vulnerability allowed to execute JavaScript code by abusing the misconfigured preview feature. It affects all users using the CKEditor 4 at version < 4.24.0-lts with affected samples used in a production environment.
Patches
The problem has been recognized and patched. The fix will be available in version 4.24.0-lts.
For more information
Email us at [security@cksource.com](mailto:security@cksource.com) if you have any questions or comments about this advisory.
Acknowledgements
The CKEditor 4 team would like to thank Marcin Wyczechowski & Michał Majchrowicz AFINE Team for recognizing and reporting this vulnerability.
Is GHSA-mw2c-vx6j-mg76 in any of your client repos?
Checking one package by hand is fine. Checking it across forty client projects is not. NPMscan reads the lockfiles in every GitHub repo you pick, finds each project with an affected ckeditor4, and gives you the command that fixes it.
References
Advisory data from OSV.dev (opens OSV.dev in a new tab), refreshed daily.