description: 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.
affected:
{
product: Jenkins
vendor: Jenkins project
versions:
lessThanOrEqual: 2.274, status: affected, version: unspecified, versionType: custom
lessThanOrEqual: LTS 2.263.1, status: affected, version: unspecified, versionType: custom
}