An issue was discovered in Kaltura server Lynx-12.11.0. The vulnerability exists due to insufficient filtration of user-supplied data passed to the "server-Lynx-12.11.0/admin_console/web/tools/XmlJWPlayer.php" URL. An attacker could execute arbitrary HTML and script code in a browser in the context of the vulnerable website.
https://github.com/kaltura/server/issues/5303
https://github.com/kaltura/server/commit/041a6d5e8336f7713985b120139c8f4b6279a337