⚠️️️ Please note that this release is a part of CKEditor 4 Extended Support Model, only available to customers who decided to acquire the LTS (Long Term Support) version of the editor. All editor versions below 4.25.0-lts can no longer be considered as secure! ⚠️
Security Updates:
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Fixed reflected cross-site scripting (XSS) vulnerability in Code Snippet GeSHi plugin reported by Jiasheng He from Qihoo 360.
Issue summary: The vulnerability allowed a reflected XSS attack by exploiting a flaw in the GeSHi syntax highlighter library hosted by the victim. The GeSHi library was included as a vendor dependency in CKEditor 4 source files. In a specific scenario, an attacker could craft a malicious script that could be executed by sending a request to the GeSHi library hosted on a PHP web server. See GHA for more details.
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Fixed low-risk cross-site scripting (XSS) vulnerability linked to potential domain takeover
Issue summery: A theoretical vulnerability has been identified in CKEditor 4.22 (and above). In a highly unlikely scenario where an attacker gains control over the https://cke4.ckeditor.com domain, they could potentially execute an attack on CKEditor 4 instances. Although the vulnerability is purely hypothetical, we have addressed it in CKEditor 4.25.0-lts to ensure compliance with security best practices. See GHA for more details.
You can read more details in the relevant security advisories. Contact us if you have more questions.
An upgrade is highly recommended!
Updated dependencies:
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CodeMirror (used only in the Toolbar Configurator in samples) has been updated to v5.65.17 for improved stability and performance.
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Highlight.js (used by the Code Snippet plugin) has been updated to v11.9.0, introducing two breaking changes:
- dropped support for Internet Explorer,
- updated list of the supported themes – some of the themes are no longer officially supported, others may have their names changed (e.g.
monokai_sublimeis nowmonokai-sublime). Please verify the value of yourconfig.codeSnippet_themeconfiguration option and adjust theme names as needed. The list of available themes can be checked in theplugins/codesnippet/lib/highlight/stylesdirectory.
⚠️️️ Please note that this release is a part of CKEditor 4 Extended Support Model, only available to customers who decided to acquire the LTS (Long Term Support) version of the editor. All editor versions below 4.24.0-lts can no longer be considered as secure! ⚠️
Security Updates:
-
Fixed cross-site scripting (XSS) vulnerability caused by incorrect CDATA detection reported by Michal Frýba, ALEF NULA.
Issue summary: The vulnerability allowed to inject malformed HTML content bypassing Advanced Content Filtering mechanism, which could result in executing JavaScript code. See GHA for more details.
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Fixed cross-site scripting (XSS) vulnerability in AJAX sample reported by Rafael Pedrero, see INCIBE report.
Issue summary: The vulnerability allowed to execute JavaScript code by abusing the AJAX sample. See GHA for more details.
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Cross-site scripting (XSS) vulnerability in samples with enabled the preview feature reported by Marcin Wyczechowski & Michał Majchrowicz, AFINE Team.
Issue summary: The vulnerability allowed to execute JavaScript code by abusing the misconfigured preview feature. See GHA for more details.
You can read more details in the relevant security advisories. Contact us if you have more questions.
An upgrade is highly recommended!
Fixed Issues:
- Fixed: The CDATA parsing mechanism incorrectly detects the end of CDATA content. This fix unifies how style and script elements are parsed with the browser's behavior.
This release introduces the LTS (”Long Term Support”) version of the editor, available under commercial terms ("Extended Support Model").
If you acquired the Extended Support Model for CKEditor 4 LTS, please read the CKEditor 4 LTS key activation guide.
This is the last open source release of CKEditor 4. As announced in 2018, CKEditor 4 has reached its End of Life in June 2023.
New Features:
- #5316: Added vertical margins support for list elements in the Paste from Word plugin.
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#5410: Added the ability to indicate the language of styles in the Styles Combo plugin via the
config.styleSetconfiguration option. -
#5510: Added notification system to the editor informing users that the editor version is up-to-date and secure. See
config.versionCheckconfiguration option to learn more.
Fixed Issues:
- #5437: Fixed: Incorrect indication of selected items in combo boxes. The selected item was unmarked upon each opening of the combo box.
- #5495: Fixed: Insufficient color ratio for links inside Notifications.
Other Changes:
Security Updates:
A cross-site scripting vulnerability has been discovered affecting Iframe Dialog and Media Embed plugins.
This vulnerability might affect a small percentage of integrators that depend on dynamic editor initialization/destroy mechanism. See GitHub advisory for more details.
Potential breaking changes
In some rare cases, a security release may introduce a breaking change to your application. We have provided configuration options that will help you mitigate any potential issues with the upgrade:
- Starting from version 4.21, the Iframe Dialog plugin applies the
sandboxattribute by default, which restricts JavaScript code execution in the iframe element. To change this behavior, configure theconfig.iframe_attributesoption. - Starting from version 4.21, the Media Embed plugin regenerates the entire content of the embed widget by default. To change this behavior, configure the
config.embed_keepOriginalContentoption.
If you choose to change either of the above options, make sure to properly configure Content Security Policy to avoid any potential security issues that may arise from embedding iframe elements on your web page.
You can read more details in the relevant security advisory and contact us if you have more questions.
An upgrade is highly recommended!
New Features:
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#4400: Added the
config.uploadImage_supportedTypesconfiguration option allowing to change the image formats accepted by the Upload Image plugin. Thanks to SilverYoCha!
Fixed Issues:
- #5431: Fixed: No notification is shown when pasting or dropping unsupported image types into the editor.