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Cross-site Scripting (XSS) The advisory has been revoked - it doesn't affect any version of package ckeditor  (opens in a new tab)

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EPSS
0.73% (50th percentile)

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  • Snyk IDSNYK-UBUNTU1604-CKEDITOR-3370202
  • published1 Jun 2025
  • disclosed22 Mar 2023
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Introduced: 22 Mar 2023

CVE-2023-28439  (opens in a new tab)
CWE-79  (opens in a new tab)

Amendment

The Ubuntu security team deemed this advisory irrelevant for Ubuntu:16.04.

NVD Description

Note: Versions mentioned in the description apply only to the upstream ckeditor package and not the ckeditor package as distributed by Ubuntu.

CKEditor4 is an open source what-you-see-is-what-you-get HTML editor. A cross-site scripting vulnerability has been discovered affecting Iframe Dialog and Media Embed packages. The vulnerability may trigger a JavaScript code after fulfilling special conditions: using one of the affected packages on a web page with missing proper Content Security Policy configuration; initializing the editor on an element and using an element other than <textarea> as a base; and destroying the editor instance. This vulnerability might affect a small percentage of integrators that depend on dynamic editor initialization/destroy mechanism.

A fix is available in CKEditor4 version 4.21.0. In some rare cases, a security fix may be considered a breaking change. Starting from version 4.21.0, the Iframe Dialog plugin applies the sandbox attribute by default, which restricts JavaScript code execution in the iframe element. To change this behavior, configure the config.iframe_attributes option. Also starting from version 4.21.0, the Media Embed plugin regenerates the entire content of the embed widget by default. To change this behavior, configure the config.embed_keepOriginalContent option. Those who choose to enable either of the more permissive options or who cannot upgrade to a patched version should properly configure Content Security Policy to avoid any potential security issues that may arise from embedding iframe elements on their web page.