An issue was discovered in LemonLDAP::NG before 2.16.1. Weak session ID generation in the AuthBasic handler and incorrect failure handling during a password check allow attackers to bypass 2FA verification. Any plugin that tries to deny session creation after the store step does not deny an AuthBasic session.
https://lists.debian.org/debian-lts-announce/2023/07/msg00018.html
https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/releases/v2.16.1
https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/issues/2896