In Jenkins 2.399 and earlier, 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.
[
{
"defaultStatus": "affected",
"product": "Jenkins",
"vendor": "Jenkins Project",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "2.400",
"versionType": "maven"
}
]
}
]