Joomla! before 2.5.3 allows Admin Account Creation.
[
{
"product": "Joomla!",
"vendor": "Joomla!",
"versions": [
{
"status": "affected",
"version": "2.5.2"
},
{
"status": "affected",
"version": "2.5.1"
},
{
"status": "affected",
"version": "2.5.0"
},
{
"status": "affected",
"version": "and all 1.7.x and 1.6.x releases"
}
]
}
]