An issue was discovered in Joomla! 3.9.0 through 3.9.22. Improper handling of the username leads to a user enumeration attack vector in the backend login page.
[
{
"product": "Joomla! CMS",
"vendor": "Joomla! Project",
"versions": [
{
"status": "affected",
"version": "3.9.0-3.9.22"
}
]
}
]