MediaWiki before 1.23.15, 1.26.x before 1.26.4, and 1.27.x before 1.27.1 does not generate head items in the context of a given title, which allows remote attackers to obtain sensitive information via a parse action to api.php.
{
"versions": [
{
"introduced": "0"
},
{
"last_affected": "1.23.14"
},
{
"introduced": "0"
},
{
"last_affected": "1.26.0"
},
{
"introduced": "0"
},
{
"last_affected": "1.26.1"
},
{
"introduced": "0"
},
{
"last_affected": "1.26.2"
},
{
"introduced": "0"
},
{
"last_affected": "1.26.3"
},
{
"introduced": "0"
},
{
"last_affected": "1.26.4"
},
{
"introduced": "0"
},
{
"last_affected": "1.27.0"
}
]
}