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urllib3 before 1.24.2 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. NOTE: this issue exists because of an incomplete fix for CVE-2018-20060 (which was case-sensitive).

🗓️ 03 Sep 2025 23:11:12Reported by MicrosoftType 
mscve
 mscve🔗 msrc.microsoft.com👁 1 Views

urllib3 before 1.24.2 leaves the authorization header on cross-origin redirects, risking credentials.

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03 Sep 2025 23:11Current
7High risk
Vulners AI Score7
CVSS 25
CVSS 39.8
CVSS 3.16.1
EPSS0.00656
SSVC
urllib3 vulnerabilityauthorization headercross origin redirectscredential exposureCVE-2018-20060
1