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HIGH7.6

GHSA-6226-h7ff-ch6c

Widget feature vulnerability allowing to execute JavaScript code using undo functionality

Quick fix

GHSA-6226-h7ff-ch6c — ckeditor4: upgrade to the fixed version with the command below.

npm install ckeditor4@4.16.2

Details

### Affected packages The vulnerability has been discovered in [Widget](https://ckeditor.com/cke4/addon/clipboard) plugin if used alongside [Undo](https://ckeditor.com/cke4/addon/undo) feature.

### Impact A potential vulnerability has been discovered in CKEditor 4 [Widget](https://ckeditor.com/cke4/addon/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](https://github.com/skavans)) for recognizing and reporting this vulnerability.

Are you affected?

Enter the version of the package you're using.

Affected packages

npm/ckeditor4
Introduced in: 4.13.0Fixed in: 4.16.2
Fixnpm install ckeditor4@4.16.2

References