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3 actionable advisories, newest first. Withdrawn advisories and news are excluded. Coverage is partial.
Affected packages @ckeditor/ckeditor5-markdown-gfm @ckeditor/ckeditor5-html-support @ckeditor/ckeditor5-html-embed Impact A cross-site scripting vulnerability has been discovered affecting three optional CKEditor 5's packages. The vulnerability allowed to trigger a JavaScript code after fulfilling special conditions: a) Using one of the affected packages. In case of ckeditor5-html-support and ckeditor5-html-embed, additionally, it was required to use a configuration that allows unsafe markup inside the editor, b) Initializing the editor on an element and using an element other than <textarea as a base, c) Destroying the editor instance. The root cause of the issue was a mechanism responsible for updating the source element with the markup coming from the CKEditor 5 data pipeline after destroying the editor. This vulnerability might affect a small percent of integrators that depend on dynamic editor initialization/destroy and use Markdown, General HTML Support or HTML embed features.…
Recommended action: Upgrade to 35.0.1 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.
Impact A regular expression denial of service (ReDoS) vulnerability has been discovered in multiple CKEditor 5 packages. The vulnerability allowed to abuse particular regular expressions, which could cause a significant performance drop resulting in a browser tab freeze. It affects all users using the CKEditor 5 packages listed above at version <= 26.0.0. Patches The problem has been recognized and patched. The fix will be available in version 27.0.0. For more information Email us at security@cksource.com if you have any questions or comments about this advisory. Acknowledgements The CKEditor 5 team would like to thank Yeting Li for recognizing and reporting these vulnerabilities.
Recommended action: Upgrade to 27.0.0 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.
Impact A regular expression denial of service (ReDoS) vulnerability has been discovered in the CKEditor 5 Markdown plugin code. The vulnerability allowed to abuse a link recognition regular expression, which could cause a significant performance drop resulting in a browser tab freeze. It affects all users using the CKEditor 5 Markdown plugin at version <= 24.0.0. Patches The problem has been recognized and patched. The fix will be available in version 25.0.0. Workarounds The user can work around the issue by: - Upgrading CKEditor 5 to version 25.0.0. - Disabling the Markdown plugin. More information If you have any questions or comments about this advisory: Email us at security@cksource.com Acknowledgements The CKEditor 5 team would like to thank Erik Krogh Kristensen from the GitHub team for recognizing this vulnerability and Alvaro Muñoz from GitHub for reporting it.
Recommended action: Upgrade to 25.0.0 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.