Jenkins Active Directory Plugin 2.41 and earlier follows LDAP referrals by default.

Jenkins Active Directory Plugin 2.41 and earlier deserializes data from LDAP referrals without validation.

Jenkins Active Directory Plugin 2.30 and earlier ignores the "Require TLS" and "StartTls" options and always performs the connection test to Active directory unencrypted, allowing attackers able to capture network traffic between the Jenkins controller and Active Directory servers to obtain Active Directory credentials.