{"cve":"CVE-2018-20060","nvd":{"published":"2018-12-11T17:29:00.380","modified":"2026-06-17T01:52:14.007","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":[],"references":["http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00039.html","https://access.redhat.com/errata/RHSA-2019:2272","https://bugzilla.redhat.com/show_bug.cgi?id=1649153","https://github.com/urllib3/urllib3/blob/master/CHANGES.rst","https://github.com/urllib3/urllib3/issues/1316"],"products":["fedoraproject:fedora","python:urllib3"],"source":"nvd","synced_at":"2026-10-19T20:54:36.112582389+00:00"},"epss":{"cve":"CVE-2018-20060","score":0.04488,"percentile":0.91481,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-www2-v7xj-xrc6","url":"https://osv.dev/vulnerability/GHSA-www2-v7xj-xrc6","summary":"Exposure of Sensitive Information to an Unauthorized Actor in urllib3","modified":"2024-12-27T18:35:28.737156Z","packages":[{"ecosystem":"PyPI","name":"urllib3","purl":"pkg:pypi/urllib3","ranges":["<1.23"],"fixed":["1.23"]}]},{"id":"PYSEC-2018-32","url":"https://osv.dev/vulnerability/PYSEC-2018-32","summary":"","modified":"2023-11-08T04:00:10.720105Z","packages":[{"ecosystem":"PyPI","name":"urllib3","purl":"pkg:pypi/urllib3","ranges":["<1.23"],"fixed":["1.23"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}