CVE-2018-20060
This can allow for credentials in the Authorization header to be exposed to unintended hosts or transmitted in cleartext.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.49%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.0
- 9.8 CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 4.49% probability · 91th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- python/urllib3 · fedoraproject/fedora
- Source
- cve@mitre.org
EPSS 4.5% since 28 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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=1649153Issue Tracking, Mitigation, Patch, Third Party Advisory
- https://github.com/urllib3/urllib3/blob/master/CHANGES.rstRelease Notes, Third Party Advisory
- https://github.com/urllib3/urllib3/issues/1316Third Party Advisory
- https://github.com/urllib3/urllib3/pull/1346Third Party Advisory
- 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=1649153Issue Tracking, Mitigation, Patch, Third Party Advisory
- https://github.com/urllib3/urllib3/blob/master/CHANGES.rstRelease Notes, Third Party Advisory
- https://github.com/urllib3/urllib3/issues/1316Third Party Advisory
- https://github.com/urllib3/urllib3/pull/1346Third Party Advisory
- 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://security.netapp.com/advisory/ntap-20241227-0010/
- https://usn.ubuntu.com/3990-1/
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.