modauthmellon through 0.14.2 has an Open Redirect via the login?ReturnTo= substring, as demonstrated by omitting the // after http: in the target URL.
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-13038.json"
[
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "8.8"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "30"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "31"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "18.04"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "18.10"
}
]
}
]