Elasticsearch Security versions 6.5.0 and 6.5.1 contain an XXE flaw in Machine Learning's findfilestructure API. If a policy allowing external network access has been added to Elasticsearch's Java Security Manager then an attacker could send a specially crafted request capable of leaking content of local files on the Elasticsearch node. This could allow a user to access information that they should not have access to.
{
"versions": [
{
"introduced": "0"
},
{
"last_affected": "6.5.0"
},
{
"introduced": "0"
},
{
"last_affected": "6.5.1"
}
]
}