* Fixed XSS vulnerability in the [Color History feature](https://ckeditor.com/docs/ckeditor4/latest/features/colorbutton.html#color-history) reported by [Mark Wade](https://github.com/mark-wade).
Issue summary: It was possible to execute an XSS-type attack inside CKEditor 4 by persuading a victim to paste a specially crafted HTML code into the [Color Button](https://ckeditor.com/cke4/addon/colorbutton) dialog.
**An upgrade is highly recommended!**
Fixed Issues:
*[#4293](https://github.com/ckeditor/ckeditor4/issues/4293): Fixed: The [`CKEDITOR.inlineAll()`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR.html#method-inlineAll) method tries to initialize inline editor also on elements with an editor already attached to them.
*[#3961](https://github.com/ckeditor/ckeditor4/issues/3961): Fixed: The [Table Resize](https://ckeditor.com/cke4/addon/tableresize) plugin prevents editing of merged cells.
*[#3649](https://github.com/ckeditor/ckeditor4/issues/3649): Fixed: Applying a [block format](https://ckeditor.com/docs/ckeditor4/latest/features/format.html) should remove existing block styles.
*[#4282](https://github.com/ckeditor/ckeditor4/issues/4282): Fixed: The [script loader](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_scriptLoader.html) does not execute callback for scripts already loaded when called for the second time. Thanks to [Alexander Korotkevich](https://github.com/aldoom)!
*[#4273](https://github.com/ckeditor/ckeditor4/issues/4273): Fixed: A memory leak in the [`CKEDITOR.domReady()`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR.html#method-domReady) method connected with not removing `load` event listeners. Thanks to [rohit1](https://github.com/rohit1)!
*[#1330](https://github.com/ckeditor/ckeditor4/issues/1330): Fixed: Incomplete CSS margin parsing if an `auto` or `0` value is used.
*[#4286](https://github.com/ckeditor/ckeditor4/issues/4286): Fixed: The [Auto Grow](https://ckeditor.com/cke4/addon/autogrow) plugin causes the editor width to be set to `0` on editor resize.
*[#848](https://github.com/ckeditor/ckeditor4/issues/848): Fixed: Arabic text not being "bound" correctly when pasting. Thanks to [Thomas Hunkapiller](https://github.com/devoidfury) and [J. Ivan Duarte Rodríguez](https://github.com/jidrone-mbm)!
API Changes:
*[#3649](https://github.com/ckeditor/ckeditor4/issues/3649): Added a new [`stylesRemove`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_editor.html#event-stylesRemove) editor event.
Other Changes:
*[#4262](https://github.com/ckeditor/ckeditor4/issues/4262): Removed the global reference to the `stylesLoaded` variable. Thanks to [Levi Carter](https://github.com/swiftMessenger)!
* Updated the [Export to PDF](https://ckeditor.com/cke4/addon/exportpdf) plugin to `1.0.1` version:
* Improved external CSS support for [classic editor](https://ckeditor.com/docs/ckeditor4/latest/examples/classic.html) by handling exceptions and displaying convenient [error messages](https://ckeditor.com/docs/ckeditor4/latest/guide/dev_errors.html#exportpdf-stylesheets-incaccessible).