Description
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).
Published: 2023-10-15
Score: 6.1 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
EUVD EUVD EUVD-2023-0253 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).
Github GHSA Github GHSA GHSA-gwvm-45gx-3cf8 Authorization Header forwarded on redirect
Ubuntu USN Ubuntu USN USN-6473-1 urllib3 vulnerabilities
Ubuntu USN Ubuntu USN USN-6473-2 pip vulnerabilities
History

Fri, 20 Feb 2026 18:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Subscriptions

Python Urllib3
Redhat Enterprise Linux
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2024-09-16T19:01:58.850Z

Reserved: 2023-10-15T00:00:00.000Z

Link: CVE-2018-25091

cve-icon Vulnrichment

Updated: 2024-08-05T12:33:47.870Z

cve-icon NVD

Status : Modified

Published: 2023-10-15T19:15:09.213

Modified: 2024-11-21T04:03:32.303

Link: CVE-2018-25091

cve-icon Redhat

Severity : Moderate

Publid Date: 2023-10-15T00:00:00Z

Links: CVE-2018-25091 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses