In Jenkins LTS 2.387.3 and earlier, POST requests are sent in order to load the list of context actions. If part of the URL includes insufficiently escaped user-provided values, a victim may be tricked into sending a POST request to an unexpected endpoint by opening a context menu.
{ "severity": "High", "cpes": [ "cpe:2.3:a:jenkins:jenkins:*:*:*:*:lts:*:*:*", "cpe:2.3:a:jenkins:jenkins:*:*:*:*:-:*:*:*" ] }