Redmine before 4.0.9, 4.1.x before 4.1.3, and 4.2.x before 4.2.1 allows users to circumvent the allowed filename extensions of uploaded attachments.
{
"versions": [
{
"introduced": "0"
},
{
"fixed": "4.0.9"
},
{
"introduced": "4.1.0"
},
{
"fixed": "4.1.3"
},
{
"introduced": "4.2.0"
},
{
"fixed": "4.2.1"
}
]
}