In Apache Hadoop versions 3.0.0-alpha2 to 3.0.0, 2.9.0 to 2.9.2, 2.8.0 to 2.8.5, any users can access some servlets without authentication when Kerberos authentication is enabled and SPNEGO through HTTP is not enabled.
{
"versions": [
{
"introduced": "2.8.0"
},
{
"last_affected": "2.8.5"
},
{
"introduced": "2.9.0"
},
{
"last_affected": "2.9.2"
},
{
"introduced": "0"
},
{
"last_affected": "3.0.0-NA"
},
{
"introduced": "0"
},
{
"last_affected": "3.0.0-alpha2"
}
]
}