RubySec

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CVE-2021-32808 (ckeditor): Widget feature vulnerability allowing to execute JavaScript code using undo functionality

ADVISORIES

GEM

ckeditor

SEVERITY

CVSS v3.x: 7.6 (High)

UNAFFECTED VERSIONS

  • < 5.1.2

PATCHED VERSIONS

  • >= 5.1.2

DESCRIPTION

Affected packages

The vulnerability has been discovered in Widget plugin if used alongside Undo feature.

Impact

A potential vulnerability has been discovered in CKEditor 4 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) for recognizing and reporting this vulnerability.

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