CVE-2018-20060: python-urllib3: Cross-host redirect does not remove Authorization header allow for credential exposure

Severity: Critical

CVSS Score: 9.8

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.