Jenkins 2.274 and earlier, LTS 2.263.1 and earlier allows reading arbitrary files using the file browser for workspaces and archived artifacts by following symlinks.
{
"severity": "Medium",
"cpes": [
"cpe:2.3:a:jenkins:jenkins:*:*:*:*:lts:*:*:*",
"cpe:2.3:a:jenkins:jenkins:*:*:*:*:-:*:*:*"
]
}