Sourced from ckeditor/ckeditor's changelog.

⚠️️️ CKEditor 4 (the open source edition) is no longer maintained. ⚠️

If you would like to keep access to future CKEditor 4 security patches, check the Extended Support Model, which guarantees security updates and critical bug fixes until December 2026. Alternatively, upgrade to CKEditor 5.

CKEditor 4.23.0-lts

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.

CKEditor 4.22.0 / 4.22.1

⚠️ 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.
• #5410: Added the ability to indicate the language of styles in the Styles Combo plugin via the config.styleSet configuration option.
• #5510: Added notification system to the editor informing users that the editor version is up-to-date and secure. See config.versionCheck configuration 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:

• #5412: Prevent using document.domain in Firefox in the Preview plugin.

Note: CKEditor 4.22.1 has been released immediately after 4.22.0 to fix the README issues on npm and contains no changes vs 4.22.0.

CKEditor 4.21.0

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 sandbox attribute by default, which restricts JavaScript code execution in the iframe element. To change this behavior, configure the config.iframe_attributes option.
• 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_keepOriginalContent option.

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.

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• 1690c8f Added CKEditor 4.17.0 standard-all.
• b2758d4 Added CKEditor 4.16.2 standard-all.
• 814c589 Added CKEditor 4.16.1 standard-all.
• See full diff in compare view

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