urllib3 before version 1.23 does not remove the Authorization HTTP header when following a cross-origin redirect (i.e., a redirect that differs in host, port, or scheme). This can allow for credentials in the Authorization header to be exposed to unintended hosts or transmitted in cleartext.
{
"nvd_published_at": "2018-12-11T17:29:00Z",
"cwe_ids": [
"CWE-200"
],
"severity": "CRITICAL",
"github_reviewed": true,
"github_reviewed_at": "2020-06-16T22:01:30Z"
}