The defaults settings for the CORS filter provided in Apache Tomcat 9.0.0.M1 to 9.0.8, 8.5.0 to 8.5.31, 8.0.0.RC1 to 8.0.52, 7.0.41 to 7.0.88 are insecure and enable 'supportsCredentials' for all origins. It is expected that users of the CORS filter will have configured it appropriately for their environment rather than using it in the default configuration. Therefore, it is expected that most users will not be impacted by this issue.
https://www.oracle.com/security-alerts/cpuapr2020.html
https://www.debian.org/security/2019/dsa-4596
https://usn.ubuntu.com/3665-1/
https://security.netapp.com/advisory/ntap-20181018-0002/
https://seclists.org/bugtraq/2019/Dec/43
https://lists.debian.org/debian-lts-announce/2019/08/msg00015.html
https://lists.debian.org/debian-lts-announce/2018/06/msg00008.html
https://access.redhat.com/errata/RHSA-2019:2205
https://access.redhat.com/errata/RHSA-2019:1529
https://access.redhat.com/errata/RHSA-2019:0451
https://access.redhat.com/errata/RHSA-2019:0450
https://access.redhat.com/errata/RHSA-2018:3768
https://access.redhat.com/errata/RHSA-2018:2470
https://access.redhat.com/errata/RHSA-2018:2469
http://www.securitytracker.com/id/1041888
http://www.securitytracker.com/id/1040998
http://www.securityfocus.com/bid/104203
http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
http://tomcat.apache.org/security-9.html