Froxlor versions through 2.3.10 have an issue where sensitive columns, specifically the dkim_privkey field, are not filtered from API responses in certain domain-related API calls. This allows authenticated non-superadmin admins with the delegated customers_see_all flag to access DKIM private keys of other tenants' domains. The vulnerability enables unauthorized reading of private signing keys, which could be used to sign emails that pass DKIM verification and DMARC alignment. The issue was fixed in version 2.3.12.