CVE-2018-20060
9.8
CRITICAL · CVSS 3.0 · EPSS 4.5% (pctl 91)
In your normal cycle
Critical by CVSS (9.8), but no sign of active exploitation.
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.
Scoring
| CVSS | 9.8 (CRITICAL, v3.0) |
|---|---|
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 4.49% — more likely to be exploited than 91% of all CVEs |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2018-12-11 |
| Last modified | 2026-06-17 |
Affected (2)
| Vendor | Product |
|---|---|
| fedoraproject | fedora |
| python | urllib3 |
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
- https://github.com/urllib3/urllib3/pull/1346
- https://lists.debian.org/debian-lts-announce/2021/06/msg00015.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5SJERZEJDSUYQP7BNBXMBHRHGY26HRZD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BXLAXHM3Z6DUCXZ7ZXZ2EAYJXWDCZFCT/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XWP36YW3KSVLXDBY3QJKDYEPCIMN3VQZ/
- https://usn.ubuntu.com/3990-1/
- 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
- https://github.com/urllib3/urllib3/pull/1346
- https://lists.debian.org/debian-lts-announce/2021/06/msg00015.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5SJERZEJDSUYQP7BNBXMBHRHGY26HRZD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BXLAXHM3Z6DUCXZ7ZXZ2EAYJXWDCZFCT/
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