Jenkins LTS 2.452.3 and earlier allows agent processes to read arbitrary files from the Jenkins controller file system by using the ClassLoaderProxy#fetchJar method in the Remoting library.
{
"cpes": [
"cpe:2.3:a:jenkins:jenkins:*:*:*:*:lts:*:*:*",
"cpe:2.3:a:jenkins:jenkins:*:*:*:*:*:maven:*:*"
],
"severity": "High"
}