X-Pack 5.1.1 did not properly apply document and field level security to multi-search and multi-get requests so users without access to a document and/or field may have been able to access this information.
[
{
"product": "Elastic X-Pack Security",
"vendor": "Elastic",
"versions": [
{
"status": "affected",
"version": "5.1.1"
}
]
}
]