CVE ID:

CVE-2023-28439

Description:

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 `` 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. </td></tr> <tr><td class=std valign=top>Test IDs:</td><td class=std> <a href="catid.html?id=1.3.6.1.4.1.25623.1.0.884950">1.3.6.1.4.1.25623.1.0.884950</a>   <a href="catid.html?id=1.3.6.1.4.1.25623.1.0.126035">1.3.6.1.4.1.25623.1.0.126035</a>   <a href="catid.html?id=1.3.6.1.4.1.25623.1.0.126036">1.3.6.1.4.1.25623.1.0.126036</a>   <a href="catid.html?id=1.3.6.1.4.1.25623.1.0.885130">1.3.6.1.4.1.25623.1.0.885130</a>   <a href="catid.html?id=1.3.6.1.4.1.25623.1.0.884956">1.3.6.1.4.1.25623.1.0.884956</a>   </td></tr> <tr><td class=std valign=top>Cross References:</td><td class=std> <a href="/smysecure/catid.html?ctype=cve&id=CVE-2023-28439">Common Vulnerability Exposure (CVE) ID: CVE-2023-28439</a><br> <a href="https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L4ODGOW6PYVOXHQSMWJBOCE6DXWAI33W/">https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L4ODGOW6PYVOXHQSMWJBOCE6DXWAI33W/</a><br> <a href="https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GWKG2VCPJNETVCDTXU4X6FQ2PO6XCNGN/">https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GWKG2VCPJNETVCDTXU4X6FQ2PO6XCNGN/</a><br> <a href="https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VCYKD3JZWWA3ESOZG4PHJJEXT4EYIUIQ/">https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VCYKD3JZWWA3ESOZG4PHJJEXT4EYIUIQ/</a><br> <a href="https://ckeditor.com/cke4/addon/embed">https://ckeditor.com/cke4/addon/embed</a><br> <a href="https://ckeditor.com/cke4/addon/embed">https://ckeditor.com/cke4/addon/embed</a><br> <a href="https://ckeditor.com/cke4/addon/iframe">https://ckeditor.com/cke4/addon/iframe</a><br> <a href="https://ckeditor.com/cke4/addon/iframe">https://ckeditor.com/cke4/addon/iframe</a><br> <a href="https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-vh5c-xwqv-cv9g">https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-vh5c-xwqv-cv9g</a><br> <a href="https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-vh5c-xwqv-cv9g">https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-vh5c-xwqv-cv9g</a><br> </td></tr> </table><P><P> <br> </div> </div> <br> <hr> <P> <center><div class=xsmall>© 1998-2025 E-Soft Inc. All rights reserved.</div></center> <p> <div id=footer><script>oHelpGlobals.state = ""; </script> <div class=hide id=hsqhelptitle></div> <div class=hide id=hsqhelptext><div class=std></div></div> </div></body> </html>