Trix is vulnerable to XSS through JSON deserialization bypass in drag-and-drop (Level0InputController)

The Trix editor, in versions prior to 2.1.18, is vulnerable to XSS when a crafted application/x-trix-document JSON payload is dropped into the editor in environments using the fallback Level0InputController e.g., embedded WebViews lacking Input Events Level 2 support. The StringPiece.fromJSON...