mod_auth_mellon through 0.14.2 has an Open Redirect via the login?ReturnTo= substring, as demonstrated by omitting the // after http: in the target URL.
https://www.oracle.com/security-alerts/cpuapr2022.html
https://usn.ubuntu.com/4291-1/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XU5GVFZW3C2M4ZBL4F7UP7N24FNUCX4E/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A5E3JVHURJJNDP63CKVX5O5MJAGCQV4K/
https://github.com/Uninett/mod_auth_mellon/issues/35#issuecomment-503974885
https://lists.debian.org/debian-lts-announce/2023/03/msg00010.html
Source: Mitre, NVD
Published: 2019-06-29
Updated: 2023-11-07
Base Score: 4.3
Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N
Severity: Medium
Base Score: 6.1
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS: 0.00163