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CVE-2021-26271 (ckeditor): Regular expression Denial of Service in dialog plugin

ADVISORIES

GEM

ckeditor

SEVERITY

CVSS v3.x: 6.5 (Medium)

PATCHED VERSIONS

  • >= 5.1.2

DESCRIPTION

Affected packages

The vulnerability has been discovered and fixed in the dialog plugin. Packages indirectly affected by the issue having dialog plugin dependency:

Impact

A potential vulnerability has been discovered in CKEditor 4 dialog plugin. The vulnerability allowed to abuse a dialog input validator regular expression, which could cause a significant performance drop resulting in a browser tab freeze. It affects all users using the CKEditor 4 plugins listed above at version < 4.18.0.

Patches

The problem has been recognized and patched. The fix will be available in version 4.18.0.

For more information

Email us at security@cksource.com if you have any questions or comments about this advisory.

Acknowledgements

This issue was discovered by the CKEditor 4 team during our regular security audit.

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