An issue was discovered in Joomla! 2.5.0 through 3.9.27. Install action in com_installer lack the required hardcoded ACL checks for superusers. A default system is not affected cause the default ACL for com_installer is limited to super users already.
{
"cpes": [
"cpe:2.3:a:joomla:joomla!:*:*:*:*:*:*:*:*"
],
"severity": "High"
}