The host is installed with GitLab CE/EE 12.9 before 16.0.8, 16.1 before 16.1.3, or 16.2 before 16.2.2 and is prone to an information disclosure vulnerability. A flaw is present in the application, which fails to properly handle unspecified vectors. Successful exploitation could allow attackers to leak a user's email via an error message for groups that restrict membership by email domain.