A Server-Side Request Forgery issue in the OpenID Connect Issuer in LemonLDAP::NG before 2.17.1 allows authenticated remote attackers to send GET requests to arbitrary URLs through the request_uri authorization parameter. This is similar to CVE-2020-10770.
https://security.lauritz-holtmann.de/post/sso-security-ssrf/
https://lists.debian.org/debian-lts-announce/2023/10/msg00014.html
https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/releases/v2.17.1
https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/issues/2998