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.
{
"versions": [
{
"introduced": "2.0.0"
},
{
"last_affected": "2.6.1"
},
{
"introduced": "3.0.0"
},
{
"last_affected": "5.0.0"
},
{
"introduced": "6.0.0"
},
{
"last_affected": "6.0.9"
}
]
}{
"versions": [
{
"introduced": "14.0.0"
},
{
"last_affected": "14.6.1"
},
{
"introduced": "15.0.0"
},
{
"last_affected": "18.0.0"
},
{
"introduced": "19.0.0"
},
{
"last_affected": "19.0.8"
}
]
}