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@@ -1,5 +1,162 @@
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-CKEditor 4 Changelog
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-====================
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+⚠️️️ **CKEditor 4 (the open source edition) is no longer maintained.** ⚠️
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+
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+If you would like to keep access to future CKEditor 4 security patches, check the [Extended Support Model](https://ckeditor.com/ckeditor-4-support/), which guarantees **security updates and critical bug fixes until December 2026**. Alternatively, [upgrade to CKEditor 5](https://ckeditor.com/docs/ckeditor5/latest/updating/ckeditor4/migration-from-ckeditor-4.html).
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+
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+## CKEditor 4.22.0 / 4.22.1
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+
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+⚠️ 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.
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+
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+
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+New Features:
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+
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+* [#5316](https://github.com/ckeditor/ckeditor4/issues/5316): Added vertical margins support for list elements in the [Paste from Word](https://ckeditor.com/cke4/addon/pastefromword) plugin.
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+* [#5410](https://github.com/ckeditor/ckeditor4/issues/5410): Added the ability to indicate the language of styles in the [Styles Combo](https://ckeditor.com/cke4/addon/stylescombo) plugin via the [`config.styleSet`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-stylesSet) configuration option.
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+* [#5510](https://github.com/ckeditor/ckeditor4/issues/5510): Added notification system to the editor informing users that the editor version is up-to-date and secure. See [`config.versionCheck`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-versionCheck) configuration option to learn more.
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+
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+Fixed Issues:
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+
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+* [#5437](https://github.com/ckeditor/ckeditor4/issues/5437): Fixed: Incorrect indication of selected items in combo boxes. The selected item was unmarked upon each opening of the combo box.
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+* [#5495](https://github.com/ckeditor/ckeditor4/issues/5495): Fixed: Insufficient color ratio for links inside [Notifications](https://ckeditor.com/cke4/addon/notification).
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+
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+Other Changes:
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+
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+* [#5412](https://github.com/ckeditor/ckeditor4/issues/5412): Prevent using `document.domain` in Firefox in the [Preview](https://ckeditor.com/cke4/addon/preview) plugin.
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+
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+Note: CKEditor 4.22.1 has been released immediately after 4.22.0 to fix the README issues on [npm](https://www.npmjs.com/) and contains no changes vs 4.22.0.
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+
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+## CKEditor 4.21.0
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+
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+**Security Updates:**
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+
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+A cross-site scripting vulnerability has been discovered affecting [Iframe Dialog](https://ckeditor.com/cke4/addon/iframe) and [Media Embed](https://ckeditor.com/cke4/addon/embed) plugins.
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+
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+This vulnerability might affect a small percentage of integrators that depend on dynamic editor initialization/destroy mechanism. See [GitHub advisory](https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-vh5c-xwqv-cv9g) for more details.
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+
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+**Potential breaking changes**
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+
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+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:
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+
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+- Starting from version 4.21, the [Iframe Dialog](https://ckeditor.com/cke4/addon/iframe) 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`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-iframe_attributes) option.
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+- Starting from version 4.21, the [Media Embed](https://ckeditor.com/cke4/addon/embed) plugin regenerates the entire content of the embed widget by default. To change this behavior, configure the [`config.embed_keepOriginalContent`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-embed_keepOriginalContent) option.
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+
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+If you choose to change either of the above options, make sure to properly configure [Content Security Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP) to avoid any potential security issues that may arise from embedding iframe elements on your web page.
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+
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+You can read more details in the relevant security advisory and [contact us](security@cksource.com) if you have more questions.
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+
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+**An upgrade is highly recommended!**
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+
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+New Features:
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+
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+* [#4400](https://github.com/ckeditor/ckeditor4/issues/4400): Added the [`config.uploadImage_supportedTypes`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-uploadImage_supportedTypes) configuration option allowing to change the image formats accepted by the [Upload Image](https://ckeditor.com/cke4/addon/uploadimage) plugin. Thanks to [SilverYoCha](https://github.com/SilverYoCha)!
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+
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+Fixed Issues:
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+
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+* [#5431](https://github.com/ckeditor/ckeditor4/issues/5431): Fixed: No notification is shown when pasting or dropping unsupported image types into the editor.
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+
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+## CKEditor 4.20.2
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+
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+Fixed Issues:
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+
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+* [#439](https://github.com/ckeditor/ckeditor4/issues/439): Fixed: Incorrect <kbd>Tab</kbd> and <kbd>Shift</kbd>+<kbd>Tab</kbd> navigation for radio buttons inside the dialog.
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+* [#4829](https://github.com/ckeditor/ckeditor4/issues/4829): Fixed: Undo reversed entire table content instead of a single cell. Thanks to that fix, multiple changes in a table can be undone one by one.
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+* [#5396](https://github.com/ckeditor/ckeditor4/issues/5396): Fixed: Event listeners for `popstate` and `hashchange` events on the `window`, added by the [Maximize](https://ckeditor.com/cke4/addon/maximize) plugin, were not removed when destroying the editor instance.
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+* [#5414](https://github.com/ckeditor/ckeditor4/issues/5414): Fixed: File and image uploaders based on the [Upload Widget plugin](https://ckeditor.com/cke4/addon/uploadwidget) and [Easy Image plugin ](https://ckeditor.com/cke4/addon/easyimage) didn't fire the [`change` event](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_editor.html#event-change) upon finishing upload, resulting in passing incorrect data in form controls for integration frameworks, like [Reactive forms in Angular](https://angular.io/guide/reactive-forms).
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+* [#698](https://github.com/ckeditor/ckeditor4/issues/698): Fixed: An error was thrown after applying formatting to the widget with inline editable and switching to the source mode. Thanks to [Glen](https://github.com/glen-84)!
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+
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+API changes:
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+
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+* [#3540](https://github.com/ckeditor/ckeditor4/issues/3540): The [startup data](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_plugins_widget.html) passed to the widget's command is now used to also populate the widget's template.
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+* [#5352](https://github.com/ckeditor/ckeditor4/issues/5352): Added the [`colorButton_contentsCss`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-colorButton_contentsCss) configuration option allowing to add custom CSS to the [Color Button](https://ckeditor.com/cke4/addon/colorbutton) menu content. Thanks to [mihilion](https://github.com/mihilion)!
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+
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+## CKEditor 4.20.1
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+
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+Fixed Issues:
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+
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+* [#5333](https://github.com/ckeditor/ckeditor4/issues/5333): Fixed: The original name of the uploaded image is not preserved by the [Upload Image](https://ckeditor.com/cke4/addon/uploadimage) plugin if the [Clipboard](https://ckeditor.com/cke4/addon/clipboard) plugin has enabled image handling.
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+* [#2881](https://github.com/ckeditor/ckeditor4/issues/2881): Fixed: Changing table headers from "Both" to "First column" in the [Table](https://ckeditor.com/cke4/addon/table) dialog does not change the first column cell correctly.
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+* [#2996](https://github.com/ckeditor/ckeditor4/issues/2996): Fixed: Table header "scope" attribute is incorrect for the "Headers: both" option in the [Table](https://ckeditor.com/cke4/addon/table) dialog.
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+* [#4802](https://github.com/ckeditor/ckeditor4/issues/4802): Fixed: [Tableselection](https://ckeditor.com/cke4/addon/tableselection) caret moves to the previous cell after tabbing into the next cell and then removing its content.
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+* [#5365](https://github.com/ckeditor/ckeditor4/issues/5365): Fixed: The value of the [`config.baseFloatZIndex`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-baseFloatZIndex) config variable is incorrectly applied to parent dialog when the child dialog is closed resulting in the dialog overlay covering up the dialog. Thanks to [JenoDK](https://github.com/JenoDK)!
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+* [#5305](https://github.com/ckeditor/ckeditor4/issues/5305): Fixed: Anchor name can invalidly include spaces.
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+
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+## CKEditor 4.20
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+
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+New Features:
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+
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+* [#5084](https://github.com/ckeditor/ckeditor4/issues/5084): Added the [`config.tabletools_scopedHeaders`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-tabletools_scopedHeaders) configuration option controlling the behaviour of table headers with and without the `[scope]` attribute.
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+* [#5219](https://github.com/ckeditor/ckeditor4/issues/5219): Added the [`config.image2_defaultLockRatio`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-image2_defaultLockRatio) configuration option allowing to set the default value of the "Lock ratio" option in the [Enhanced Image](https://ckeditor.com/cke4/addon/image2) dialog.
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+* [#2008](https://github.com/ckeditor/ckeditor-dev/pull/2008): Extended the [Mentions](https://ckeditor.com/cke4/addon/mentions) and [Emoji](https://ckeditor.com/cke4/addon/emoji) plugins with a feature option that adds a space after an accepted autocompletion match. See:
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+ * [`configDefinition.followingSpace`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_plugins_mentions_configDefinition.html#property-followingSpace) option for the mentions plugin, and
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+ * [`config.emoji_followingSpace`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-emoji_followingSpace) option for the emoji plugin.
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+* [#5215](https://github.com/ckeditor/ckeditor4/issues/5215): Added the [`config.coreStyles_toggleSubSup`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-coreStyles_toggleSubSup) configuration option which disallows setting the subscript and superscript on the same element simultaneously using UI buttons. This option is turned off by default.
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+
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+Fixed Issues:
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+
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+* [#4889](https://github.com/ckeditor/ckeditor4/issues/4889): Fixed: Incorrect position of the [Table Resize](https://ckeditor.com/cke4/addon/tableresize) cursor after scrolling the editor horizontally.
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+* [#5319](https://github.com/ckeditor/ckeditor4/issues/5319): Fixed: [Autolink](https://ckeditor.com/cke4/addon/autolink) [`config.autolink_urlRegex`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-autolink_urlRegex) option produced invalid links when configured directly using the editor instance config. Thanks to [Aigars Zeiza](https://github.com/Zuzon)!
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+* [#4941](https://github.com/ckeditor/ckeditor4/issues/4941): Fixed: Some entities got wrongly encoded when using [`entities_processNumerical = true`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-entities_processNumerical) configuration option.
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+* [#4931](https://github.com/ckeditor/ckeditor4/issues/4931): Fixed: Selecting the whole editor content when there is only a list with an empty element at the end inside and deleting it did not delete all list items.
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+
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+
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+API changes:
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+
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+* [#5122](https://github.com/ckeditor/ckeditor4/issues/5122): Added the ability to provide a list of buttons as an array to the [`config.removeButtons`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-removeButtons) config variable.
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+* [#2008](https://github.com/ckeditor/ckeditor-dev/pull/2008): Added [Autocomplete](https://ckeditor.com/cke4/addon/autocomplete) [`followingSpace`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_plugins_autocomplete_configDefinition.html#property-followingSpace) option that finishes an accepted match with a space.
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+
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+## CKEditor 4.19.1
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+
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+Fixed Issues:
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+
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+* [#5125](https://github.com/ckeditor/ckeditor4/issues/5125): Fixed: Deleting a widget with disabled [autoParagraph](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-autoParagraph) by the keyboard `backspace` key removes the editor editable area and crashes the editor.
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+* [#5135](https://github.com/ckeditor/ckeditor4/issues/5135): Fixed: The [`checkbox.setValue`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_ui_dialog_checkbox.html#method-setValue) and [`radio.setValue`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_ui_dialog_radio.html#method-setValue) methods are not chainable as stated in the documentation. Thanks to [Jordan Bradford](https://github.com/LordPachelbel)!
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+* [#5085](https://github.com/ckeditor/ckeditor4/issues/5085): Fixed: The [Language](https://ckeditor.com/cke4/addon/language) plugin removes the element marking the text in foreign language if said element does not have an information about the text direction.
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+* [#4284](https://github.com/ckeditor/ckeditor4/issues/4284): Fixed: [Tableselection](https://ckeditor.com/cke4/addon/tableselection) Merging cells with a rowspan throws an unexpected error and does not create an undo step.
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+* [#5184](https://github.com/ckeditor/ckeditor4/issues/5184): Fixed: The [Editor Placeholder](https://ckeditor.com/cke4/addon/wysiwygarea) plugin degrades typing performance.
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+* [#5158](https://github.com/ckeditor/ckeditor4/issues/5158): Fixed: [`CKEDITOR.tools#convertToPx()`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_tools.html#method-convertToPx) gives invalid results if the helper calculator element was deleted from the DOM.
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+* [#5234](https://github.com/ckeditor/ckeditor4/issues/5234): Fixed: [Easy Image](https://ckeditor.com/cke4/addon/easyimage) doesn't allow to upload images files using toolbar button.
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+* [#438](https://github.com/ckeditor/ckeditor4/issues/438): Fixed: It is impossible to navigate to the [elementspath](https://ckeditor.com/cke4/addon/elementspath) from the [toolbar](https://ckeditor.com/cke4/addon/toolbar) by keyboard and vice versa.
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+* [#4449](https://github.com/ckeditor/ckeditor4/issues/4449): Fixed: [`dialog.validate#functions`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_dialog_validate.html#method-functions) incorrectly composes functions that return an optional error message, like e.g. [`dialog.validate.number`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_dialog_validate.html#method-number) due to unnecessary return type coercion.
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+* [#4473](https://github.com/ckeditor/ckeditor4/issues/4473): Fixed: The [dialog.validate](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_dialog_validate.html) method does not accept parameter value. The issue originated in [dialog.validate.functions](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_dialog_validate.html#method-functions) method that did not properly propagate parameter value to validator. Affected validators:
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+ * [`functions`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_dialog_validate.html#method-functions)
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+ * [`equals`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_dialog_validate.html#method-equals)
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+ * [`notEqual`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_dialog_validate.html#method-notEqual)
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+ * [`cssLength`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_dialog_validate.html#method-cssLength)
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+ * [`htmlLength`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_dialog_validate.html#method-htmlLength)
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+ * [`inlineStyle`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_dialog_validate.html#method-inlineStyle)
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+* [#5147](https://github.com/ckeditor/ckeditor4/issues/5147): Fixed: The [Accessibility Help](https://ckeditor.com/cke4/addon/a11yhelp) dialog does not contain info about focus being moved back to the editing area upon leaving dialogs.
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+* [#5144](https://github.com/ckeditor/ckeditor4/issues/5144): Fixed: [Menu buttons](https://ckeditor.com/cke4/addon/menubutton) and [panel buttons](https://ckeditor.com/cke4/addon/panelbutton) incorrectly indicate the open status of their associated pop-up menus in the browser's accessibility tree.
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+* [#5022](https://github.com/ckeditor/ckeditor4/issues/5022): Fixed: [Find and Replace](https://ckeditor.com/cke4/addon/find) does not respond to the `Enter` key.
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+
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+API changes:
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+
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+* [#5184](https://github.com/ckeditor/ckeditor4/issues/5184): Added the [`config.editorplaceholder_delay`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-editorplaceholder_delay) configuration option allowing to delay placeholder before it is toggled when changing editor content.
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+* [#5184](https://github.com/ckeditor/ckeditor4/issues/5184): Added the [`CKEDITOR.tools#debounce()`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_tools.html#method-debounce) function allowing to postpone a passed function execution until the given milliseconds have elapsed since the last time it was invoked.
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+
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+## CKEditor 4.19.0
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+
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+New features:
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+
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+* [#2444](https://github.com/ckeditor/ckeditor4/issues/2444): Togglable toolbar buttons are now exposed as toggle buttons in the browser's accessibility tree.
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+* [#4641](https://github.com/ckeditor/ckeditor4/issues/4641): Added an option allowing to cancel the [Delayed Editor Creation](https://ckeditor.com/docs/ckeditor4/latest/features/delayed_creation.html) feature as a function handle for editor creators ([`CKEDITOR.replace`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR.html#method-replace), [`CKEDITOR.inline`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR.html#method-inline), [`CKEDITOR.appendTo`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR.html#method-appendTo)).
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+* [#4986](https://github.com/ckeditor/ckeditor4/issues/4986): Added [`config.shiftLineBreaks`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-shiftLineBreaks) allowing to preserve inline elements formatting when the `shift`+`enter` keystroke is used.
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+* [#2445](https://github.com/ckeditor/ckeditor4/issues/2445): Added [`config.applicationTitle`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-applicationTitle) configuration option allowing to customize or disable the editor's application region label. This option, combined with [`config.title`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-title), gives much better control over the editor's labels read by screen readers.
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+
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+Fixed Issues:
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+
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+* [#4543](https://github.com/ckeditor/ckeditor4/issues/4543): Fixed: Toolbar buttons toggle state is not correctly announced by screen readers lacking the information whether the feature is on or off.
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+* [#4052](https://github.com/ckeditor/ckeditor4/issues/4052): Fixed: Editor labels are read incorrectly by screen readers due to invalid editor control type for the [Iframe Editing Area](https://ckeditor.com/cke4/addon/wysiwygarea) editors.
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+* [#1904](https://github.com/ckeditor/ckeditor4/issues/1904): Fixed: Screen readers are not announcing the read-only editor state.
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+* [#4904](https://github.com/ckeditor/ckeditor4/issues/4904): Fixed: Table cell selection and navigation with the `tab` key behavior is inconsistent after adding a new row.
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+* [#3394](https://github.com/ckeditor/ckeditor4/issues/3394): Fixed: [Enhanced image](https://ckeditor.com/cke4/addon/image2) plugin dialog is not supporting URL with query string parameters. Thanks to [Simon Urli](https://github.com/surli)!
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+* [#5049](https://github.com/ckeditor/ckeditor4/issues/5049): Fixed: The editor fails in strict mode due to not following the `use strict` directives in a core editor module.
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+* [#5095](https://github.com/ckeditor/ckeditor4/issues/5095): Fixed: The [clipboard](https://ckeditor.com/cke4/addon/clipboard) plugin shows notification about unsupported file format when the file type is different than `jpg`, `gif`, `png`, not respecting [supported types](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_fileTools_uploadWidgetDefinition.html#property-supportedTypes) by the [Upload Widget](https://ckeditor.com/cke4/addon/uploadwidget) plugin.
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+* [#4855](https://github.com/ckeditor/ckeditor4/issues/4855): [iOS] Fixed: Focusing toolbar buttons with an enabled VoiceOver screen reader moves the browser focus into an editable area and interrupts button functionality.
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+
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+API changes:
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+
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+* [#4641](https://github.com/ckeditor/ckeditor4/issues/4641): The [`CKEDITOR.replace`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR.html#method-replace), [`CKEDITOR.inline`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR.html#method-inline), [`CKEDITOR.appendTo`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR.html#method-appendTo) functions are now returning a handle function allowing to cancel the [Delayed Editor Creation](https://ckeditor.com/docs/ckeditor4/latest/features/delayed_creation.html) feature.
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+* [#5095](https://github.com/ckeditor/ckeditor4/issues/5095): Added the [CKEDITOR.plugins.clipboard.addFileMatcher](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_plugins_clipboard.html#method-addFileMatcher) function allowing to define file formats supported by the [clipboard](https://ckeditor.com/cke4/addon/clipboard) plugin. Trying to paste unsupported files will result in a notification that a file cannot be dropped or pasted into the editor.
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+* [#2445](https://github.com/ckeditor/ckeditor4/issues/2445): Added [`config.applicationTitle`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-applicationTitle) alongside [`CKEDITOR.editor#applicationTitle`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_editor.html#property-applicationTitle) to allow customizing editor's application region label.
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## CKEditor 4.18.0
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Laurent Destailleur