Jenkins 2.274 and earlier, LTS 2.263.1 and earlier does not implement any restrictions for the URL rendering a formatted preview of markup passed as a query parameter, resulting in a reflected cross-site scripting (XSS) vulnerability if the configured markup formatter does not prohibit unsafe elements (JavaScript) in markup.
{
"versions": [
{
"introduced": "0"
},
{
"last_affected": "2.263.1"
},
{
"introduced": "0"
},
{
"last_affected": "2.274"
}
]
}