A flaw was found in mod_auth_openidc before version 2.4.1. An open redirect issue exists in URLs with a slash and backslash at the beginning.
https://lists.debian.org/debian-lts-announce/2023/04/msg00034.html
https://lists.debian.org/debian-lts-announce/2020/07/msg00028.html
https://lists.debian.org/debian-lts-announce/2020/02/msg00035.html
https://github.com/zmartzone/mod_auth_openidc/pull/453
https://github.com/zmartzone/mod_auth_openidc/commit/02431c0adfa30f478cf2eb20ed6ea51fdf446be7
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00036.html