Reflected cross-site scripting in development mode handler in Vaadin 14, 15-19

URL encoding error in development mode handler in com.vaadin:flow-server versions 2.0.0 through 2.6.1 Vaadin 14.0.0 through 14.6.1, 3.0.0 through 6.0.9 Vaadin 15.0.0 through 19.0.8 allows local user to execute arbitrary JavaScript code by opening crafted URL in browser. See CWE-172: Encoding Erro...