Jenkins 2.540 and earlier, LTS 2.528.2 and earlier stores build authorization tokens unencrypted in job config.xml files on the Jenkins controller where they can be viewed by users with Item/Extended Read permission or access to the Jenkins controller file system.
{
"versions": [
{
"introduced": "0"
},
{
"fixed": "2.528.3"
},
{
"introduced": "0"
},
{
"fixed": "2.541"
}
]
}