CKEditor version 4 is used in Tiki for a WYSIWYG editor for HTML content.

In 2008, CKEditor added as part of Tiki2
In 2017, CKEditor version 5 was released
In 2018, CKEditor announced a license change
In 2023, The Open Source version of CKEditor 4 reached end of life
In 202?, users start receiving messages encouraging them to purchase an extended support plan for CKEditor version 4 (Or upgrade to version 5)

• Most WYSIWYG editors are designed to HTML content, and getting them to work with textual content (like wiki syntax) is very difficult

  
  

• TOAST UI Editor
• Quill
• summernote
• Trix
• Slate

  
  

• https://forum.xwiki.org/t/cke-editor-warning-4-22-1-version-not-secure/14020